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Databases Questions and Answers January 31, 2021

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Which is more efficient way to determine the optimal number of multiplications in a matrix-chain multiplication problem: enumerating all the ways of parenthesizing the product and computing the number of multiplications for each, or running RECURSIVE-MATRIX-CHAIN? Justify your answer.

Consider a system with a small virtual address space of 3 2 K B using a single - level page table where each page is 1 K B . How many bits are used to represent the virtual page number? A . 5 B . None of these C . 3 2 D . 1 5 E . 1 0
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Real DNA sequences are inhomogeneous and can be described by a hidden Markov model with hidden states representing different types of nucleotide composition. Consider an HMM that includes two hidden states H and L for high and lower C + G content, respectively. Initial probabilities for both H and L are equal to 0 . 5 , while transition

You Can use a key for coding and decoding. What is false about this key? Select one: a . The key is a string cross out b . The key can be of any length cross out c . The key needs to be at least 5 cross out characters long and up to 2 5 6 d . The key can have digits Clear my choice
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(e) Suppose that a scientist developed a cure of zombinization. As a result, the transition matrix is changed to P 0.8 0.1 0.1 0.3 0.5 0.2 B 0 Which states do communicate? Figure out classes. (1pt)
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Write this table in javascript with 2 loops \begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|} \hline & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \\ \hline 1 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \\ \hline 2 & 2 & 4 & 6 & 8 & 10 & 12 & 14 & 16 & 18 & 20 \\ \hline 3 & 3 & 6 & 9 & 12 & 15 & 18 & 21 & 24 & 27 & 30 \\ \hline 4 & 4 & 8 & 12 & 16 & 20 & 24 & 28 &
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Please answer the question in PYTHON 3. keep the code simple. Write a for loop that prints in ascending order all the positive integers less than 200 that are divisible by both 2 and 3, separated by spaces
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4. (15 points) Suppose the API of Person class is provided, write Employee class Suppose employee is a person with additional information salary, a double type. Inherit Employee class from Person and write necessary getter and setter. You might need to overload necessary methods inherited from super class. Warning: you must use inheritance. Do not
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Write appropriate SQL statement to display unique name with the latest or current effective date and factor for given material. Solution: Currently when typing: SELECT NAME, EFFECTIVEDATE, FACTOR, MATERIAL FROM VW_MATERIAL ORDER BY NAME, MATERIAL, EFFECTIVE DATE DESC It returns records with duplicates (assume there's multiple names used and only 2
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One of the advantages of using generics is that program that use generics execute faster than programs that do not that programs that use generic code require less effort in design and development that programs that use generics are smaller when translated to byte code that more type problems can be uncovered at compile - time rather than at run
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11.What is scope change control? Explain Scope Grope, Scope Creep and Scope Leap? 12.How does a use case diagram help to define the project's scope? 13.The Guide to the Project Management Body of Knowledge defines nine knowledge areas for understanding project management. Explain any five (5) of these areas. 14.Outline the steps/guide involved

The Vermont Teddy Bear Company leased space on a prebuilt ecommerce web server. They plan to to run and manage their own Web applications. They do not have the added complexity of building a web server and maintaining the electronic commerce infrastructure needed to run their applications. This best describes?

I want explanation to help me better understand the problem. Thank you! Trace the execution of Insertion sort and Selection sort on the list: 25, 29, 7, 33, 21, 42, 57, 98, 2, 40, 11, 8, 22, 30, 24, 97
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What is the output of the below code? public static void main(String[] args) { String str = "Computer Lab Exercises"; int r = str.indexOf("Lab"); String sub = str.substring (r); System.out.println(sub + "with solutions"); } Computer Exercises with solutions Computer solutions with Exercises Computer Lab Exercises with solutions Lab Exerciseswith
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How can analysis have good precision and poor accuracy?

What is the operating system running on the computer represented by this screenshot?

Write a Java Program to simulate an interactive SQL interface like psql . It should allow the user to query, update, and create tables in the database. Make sure your program prints out the query result ( with column headings ) , the update status ( e . g . , the number of rows deleted / updated / inserted ) , or whether a table has been

Project B: Library Information System Overall description: Your team is employed by a university for the implementation of a computer system for the library and its borrowing facilities. Customer specifications: The implemented system should be able to handle the basic operations of a university library, including the following features: o It must

Given a tree of nodes that each have a name, we can look at each node as if it has a path. For example, if we had a root node "root" with children called "child1" and "child2", the paths of the nodes would be: "/root" "/root/child1" "/root/child2" Create a SearchVisitor that is given a search string, and then finds nodes whose paths contain the

During what phase of the SDLC do upgrades of outdated software upgrades occur? Disposition phase Maintenance phase Deployment phase Testing phase
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In the Serengeti National Park in Tanzania, Africa, there is a deep canyon that can only be crossed by the baboons living in the park using a rope that has been fastened on both sides by the park administration. Several baboons can cross at the same time, provided they are all going in the same direction. If eastward-moving and westward-moving

natches the key attributes of the following rational function; y=(3)/(x+1)

Which of the following is NOT a feature / requirement for a stream cipher? A . The ability to encrypt data one bit at a time. B . The output length remains constant. C . It acts like a secure pseudorandom generator. D . It achieves forward and backward secrecy

PL-SQL: 1) Write an Explicit cursor to print employee id and first name for employees who earn highest eight salary (1.5 mark) Output: Employee id is : 100 , Employee Name : Steven Employee id is : 101 , Employee Name : Neena Employee id is : 102 , Employee Name : Lex Employee id is : 145 , Employee Name : John Employee id is : 146 , Employee Name

3 - Consider the following scenario: Customers rent tapes from a store. Each time they visit the store they can rent multiple tapes. X Create an ERD ( implementation ready ) that models the above relationship. Make sure to limit your ERD to the above description and avoid including unnecessary entities. Also make sure that all relevant attributes
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A software stack diagram that describes a Macbook Pro, running native OSX, running a Virtual Box / VMware Type 2 hypervisor, running Ubuntu Linux, and running a terminal application and a browser at the same time.

SELECT ShipName AS Name, UnitPrice AS Price, ShipAddress AS Address, ShipCity AS City FROM Orders AS O JOIN [ Order Details ] AS OD ON O . OrderID = OD . OrderID; Which one of the following represents the third column in the result set? Group of answer choices

in C + + the key word "this" refers to an address of an object true or false

where x was the input and y is the smallest number that must be added to x to make it greater than 1 0

finding a error and must show the correction and same output as photo walk through all c programs begin execution with the main ()function only describe the lines which are actually executed show the values of the variable as they are calculated. if a line is executed multiple times, the student should show the values calculated each time the line
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Remaining Time: 1 hour, 58 minutes, 22 seconds. atus Path p QUESTION 57 What is synchronization and why is it important? ? T. :-- ? ? 3(12pt) TTI Arial Path p QUESTION 58 Name four states a thread can enter into? TTI Arial , 3(12pt) Click Save and Submit to saue and submit. Cliek Save All Answers to save all anncers
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1. A main method that enqueues/dequeues some test strings, modifies the head and displays the state of the queue between these different operations to demonstate how the queue is affected 2. toString() method that returns a string representation of the queue. 3. modifyHead(E value) method that updates the head of the queue

O5. Assume a computer having 31 registers and a main memory that are connected through a common bus. Assume the computer ALU can perform 16 different operations (arithmetic, shift and logic operations). The control signals are Load, Clear, and Increment controls for each register, memory read and write signals, bus select signals and ALU operation
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Of the following, which has the basic job to enforce an access control policy at the border of a network? Question 2 options: A . Firewall B . Router C . Switch D . Access Point

This is the code: function y = shannon(x,t,T) % % y = shannon(x,t,T) % % Reconstruct a band-limited approximation to the signal in x after % subsampling at intervals T (samples). % t is the time axis array % t= [0:511]*2* pi / 512; x = sin(t *8); plot(t, x); N = length(x); if N == 0; error('Invalid input array'); end y = recon(x,T); % % plot

Question 2 2 5 pts Which classic synchronization problem deals with multiple threads trying to read a shared resource simultaneously, while ensuring exclusive access when a thread wants to write to the resource? Dining philosophers problem Sleeping Barber problem Readers - Writers problem Bounded - buffer problem
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Write Java code that prompts the user for their favorite color and favorite number.

Write a context-free grammar for the following languages. L = { w : n 0 (w) = n 1 (w), w{0, 1, 2}* }

Which query type combined with the site operatory can provide temporary or backup files? Group of answer choices inurl:temp file:temp help:desk intitle:temp

The web page that the user at 10.10.10.3 visited required a username and password. What was the password that the user supplied?

Which of these is the heap property of a min heap? a . each node is greater than both of its children b . each node is greater than or equal to both of its children c . each node is less than both of its children d . each node is equal to both of its children e . each node is less than or equal to both of its children

Problem Statement: Jeremy is new intern in the company. Jeremy was asked to design a controller for a light that functions both as an ordinary light and a motion activated light and alarm. 1. If it is dark and motion sensor detects a person on the front porch, or if the switch is ON, then turn on the porch light. 2. If motion is detected but the
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Using MatLab: 2) Plot the unit step function u(). (Hint: use the heaviside Matlab command). 3) Plot the step function u(t-2)
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When a database stores view data, it uses a _ _ _ _ _ that depends on data in a corresponding _ _ _ _ _ .

Sanford Wallace sent phishing messages to Facebook users that tricked 5 0 0 , 0 0 0 of them into providing their passwords and user account information. He accessed their accounts and over a three - month period posted more than 2 7 million messages on their friends' timelines. Since he violated a court order to not access Facebook, he was
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With a suitable code illustrate the concept of Dice with different Colors using Visual Basic With screenshot of the output and the code

Which of the following is a correct description of chosen - plaintext attacks? A . The attacker can recover the plaintext of any ciphertext of its choice. B . The attacker can encrypt one pair of messages of its choice. C . The attacker is given multiple pairs of ciphertext and their corresponding plaintext. D . The attacker can obtain encryption

All info and data is provided. You will modify the Linked List of Integers program that we have discussed in lecture. The draft listInt class is flawed and you are assigned to fix the class especially these three functions: The destructor The copy constructor The assignment operator Begin by downloading the draft version of the listInt class from
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A side artist agreement means that the artist cannot appear on anyone else's records. True False
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Compiler Construction 3. Does the following NFA (alphabet = {a,b,c)) accept the string aboc? Explain briefly. Convert the following NFA to a DFA. Show that your conversion is algorithmic, either by explaining the algorithm (and doing it) or by labeling the states of the NFA and of the DFA to indicate where they came from. Be sure to show which
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solve PSC 1103: PROGRAM STRUCTURE&DESIGN 10) 1 Convert the following for loop to a while loop et answeredfor int x- 50, x0,x-2) ked out of . or (int x- 50,x cout
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Give an NFA for the language (0,1} {01}* {011}* such that there is a recognizable correspondence between the set expression and the transition diagram. Submit Below, describe how the structure of your NFA relates to the language expression above. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). B IUS Paragraph Arial 14px v TE % Q IT X2 X2
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Consider the multithreaded version of the Fibonacci algorithm. a. Draw the computation DAG for a call to fib(5). b. How much work (i.e., number of strands) is required to complete the computation of fib(5)? c. How much is the span (i.e., number of nodes in the longest path) required for the computation of fib(5)? d. What is the parallelism of the

Construct an NFA for the following: a. { {, } | } b. { {, } | } c. { {, } | } d. { {, } | }

Write program that reads a string of words separated by comma and a number from the cmd. Your program should make a list of first three words that are longer than the entered number. If there is not three words longer the entered number, you should display what ever you have as shown below. H:\>python C:\Users
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Convert 4710 to both binary and hexadecimal. b. Convert 110111012 to both decimal and hexadecimal. c. Convert 2FD16 to both binary and decimal. d. Perform hexadecimal addition: BBC16 + 30416 e. Perform binary addition: 01101110 + 00111111

Raster graphics involves the use of binary codes to represent object type, size, and orientation True Faso
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Q2// Convert 20 and 45 to binary,then using the signed-Z's complement representation to the two numbers, this to perform the binary equivalent of (20) - (45)
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what is the RE { w in { a , b } * : w contains exactly two occurrences of the substring aa } .

Submit a matlab file. San The center of mass, (T, y, z), of n particles can be calculated by: mili Si=n Lizi miyi m; 2; Lizimi m, Lizimi where xi, yi, and zi and mi are the coordinates and the mass of particle i, respectively. The coordinates and mass of six particles are listed in the following table. Calculate the center of mass of the
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The last digit of a credit card number is the check digit, which protects againts transaction errors. The following method is used to veryfy credit card numbers. Follwing steps explains the algorithm in determining if a credit card number is a valid card. . Starting from the right most digit, form the sum of every other digit. For example, if the
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While using her personal social media account at work, Suzanne accidentally posts a screenshot that contains sensitive customer data instead of the screenshot of a text exchange with a friend. Even though it was not on purpose, this is still considered a Multiple Choice policy issue. privacy issue. security breach cybercrime
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In ARM Assembly Language: Write a program that calculates the following expression, using registers: A = (2*(A + B)) - (3*(C -D)). Assign initial integer values to A, B, C and D. Note that A will be changed by reassigning the resulting calculation to A. Store A to the memory location labeled "Result", allocated by by .word. Include the class

Remember the graph Q n of the n - dimensional hypercube. Its vertices are usually labelled by bit strings of length n . Since the bit strings of length n are just the same thing as the numbers 0 , 1 , dots, 2 n - 1 written in binary, the vertices of Q n are naturally ordered. For example, Q 2 has vertices 0 = 0 0 2 , 1 = 0 1 2 , 2 = 1 0 2 and 3 =
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JAVA Program use Do-while loop to finish the following Tasks: i) Initialize two integer variables named "A" and "B", where A, B are the number of letters in your first name and last name, respectively. ii) Draw a "*" rectangle by using the Do-while loop, whose length of "A" and width of "B".

1. (20 Points) Give an English description for each of the languages generated by the following regular expressions. (a) 0*10*10*10* (b) (1)* 2. (20 Points) Write regular expressions for the following languages (you may use the character to signify any character in the alphabet) (a) The language of all strings with the alphabet a-z which contain
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Objective: Build a simple web page from scratch that utilizes D 3 . js to create interactive div elements. Each div should visually represent a data point and change its appearance when the user hovers over it . This challenge will test your ability to manipulate the DOM using D 3 . js , applying basic interactivity concepts. Tasks: Setup the HTML

Q3/ if the cpu Scheduling Policy is Round Robin with time quantum=2, Calculate the average waiting time Process arrtual time burst time Po P 7 P2 2 6 Pz - 3 4 4 10 Py
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State the 5 layers of a Federal Enterprise Architecture as discussed in Pham et al . 2 0 1 3 .

Create a simple client/server socket program in Java. The client is a Java GUI that speaks to a server socket running on a desktop machine. The server side is a Java program with no GUI, just a console program with a main. The server is going to serve up prime numbers whose bit length is specified in the client and sent to the server. Write a Java

Which of the following is not true of a forensic investigation? Group of answer choices Contamination of the crime scene may not negate derived evidence, but it should still be documented. A file copy tool may not recover all data areas of the device that are necessary for investigation. The crime scene should be modified as necessary. Only

The question is based on scheme and DrRacket. Please don't use any other language. 8-Write a procedure that takes a tree (represented as a list) and returns a list whose elements are all the leaves of the tree arranged in right to left order. For example, ( leaves '(((1 2) (3 4)) ((1 2) (3 4))) ) returns (4 3 2 1 4 3 2 1). Trace the function with

Question 6 ( 1 point ) The regular expression for the epsilon - NFA is: ( 0 + 1 ) * * 0 1 ( 0 + 1 ) * * ( 0 ) * * 0 1 ( 0 + 1 ) * * ( 0 + 1 ) * * 0 1 ( 0 + 1 ) ( 0 + 1 ) 0 1 ( 0 + 1 ) * *
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Question 13 8 pts Match the memory hierarchy element with the appropriate phrase below. A cache for a cache L1 cache A cache for a main memory L2 cache A cache for disks Main memory A cache for page table entries TLB
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/ Q8. If the following C++ code is valid, show the output. If it is invalid, explain why temp current; //Line 1 current current->link; //Line 2 current->link = last; //une 3 trail = arrent->link; //Line 1 trail trail.>link; //Lines 09. Assume that the node of a linked list is in the usual info-link form with the info of type int. The following
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Your company is planning to launch a new IT project starting July 1 that will last one year. You estimate that you will need one full - time project manager, two fulltime business analysts for the first six months, two full - time senior systems analysts for the whole year, four programmers for the months of February - May, and one full - time
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a) What is the diference between global and local optimization b) What is the diffrence between bracketing and open methods (two at least) c) write the general mathematical model and explain it briefly (two lines) Note: Do not share this question matlab course computer eng

Which of the following meets PCI DSS requirements for configuration of a perimeter firewall?

Can anyone help me with 6-18 and 6-19? Dijkstra's Algorithm. Operations Research problem. Image below. 6-. The network in Figure 6.36 gives the distances in miles between pairs of cities 1,2 and 8. Use Dijkstra's algorithm to find the shortest route between the following cifies (a) Cities 1 and 8 (b) Cities 1 and 6 (c) Cities 4 and 8 (d) Cities 2
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Which of the following is true concerning a flash ( jump ) drive? It is portable, but too heavy to be transported easily None of the choices are correct It contains a chip with transistors that can be programmed to store data without power Its storage capacity currently is limited to the equivalent of 1 0 floppy diskettes
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Write and SQL statement for these two queries. 1. For each part in the INVENTORYPART table, display its description, part number, and the average quantity sold on any order placed for that part. Round the average to the closest whole number, then sort the results by part description. 2. For each year in which part CF-004 was ordered at least once,
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True or False? Computer memory addresses are byte - addressable, meaning that each individual byte in computer memory possesses a distinct and unique memory address.

Please if possible answer in matlab code that can be subbed straight into matlab. Description (There is a file containing motor data on Blackboard called 'motordata1.csv'. The first column has time data, while the second column has angular velocity data. In the exercises below, you will be using algorithms to process this data. Your algorithms

Implement the function Indy2Vec that takes in two 3 dimentional vectors each represented as an array and tells whether they are linearly independent. v1 = np.array([0, 5, 0]) v2 = np.array([0, -10, 0]) v3 = np.array([1, 2, 3]) v4 = np.array([-2, -4, -6]) assert Indy2Vec(v1, v2) == False, "Your code said that two linearly dependent vectors were

lab table.xlsx This assignment requires you to create a PowerPoint presentation for a topic you choose. For simplicity, you may reuse the contents in the demo, Lab2 table.xlsx Note that: The animations and audio are added in the attached demo, but they are not required for this lab assignment Also, the PowerPoint presentation is saved as mp4
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A healthcare provider suddenly receives a threat from an unknown source claiming to have obtained sensitive patient data. The anonymous actor demands a significant sum of Bitcoin, threatening to release the information publicly if the provider does not make payment. This kind of scenario BEST exemplifies which threat motivation? A . Service

What is the number of element movements required, to remove the middle element from a Linked-List with size 23? Select one: a. 11 b. 10 c. 0 d. 12 Which of the following is correct in terms of element movements required, when inserting a new element at the end of a List? Select one: a. Linked List and Array-List basically perform the same b.

Question 1 : Give state diagrams of DFAs recognizing the following languages. In all parts, \ Sigma = { a , b } . 1 . { w | w has length at least 3 and its third symbol is a b } 2 . { w | w starts with b and has even length, or starts with a and has odd length }

In a nationwide poll of 1 , 8 6 6 likely voters, 1 , 2 6 6 individuals said they favor a repeal of the Affordable Care Act. Calculate the appropriate 9 2 % margin of error ( MOE ) if we plan to use Wald's phat for our confidence interval ( rather than the Score confidence interval that JMP calculates ) .
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Question Drag the line to finish the sequence. 7 S 3 M L 4 Q 2 5 P N 6 8 K A 7 Next

when the variation in the measurement system is high, then it would be difficult to seperate

Select the value shown for the array element indicated by the MATLAB code, c ( 4 ) , in the following array:

Find and fix a syntax error that prevents the method 'getValue' from being compiled. Float y, int z) { private int getValue(double x, double temp; temp=x*y/z; x-Math.pow(temp, 2); return z/x; 3 Write the sequence of methods calls from first to last in the following piece of code: 1 2 String value=methodA(); methodd(methodB(method (methodAO))),
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Please help me, will need to get these expecte output in Java. You may not use Arrays nor ArrayLists for this. public static String getVerticalBars(int maxRows, int maxCols, int bars, char color1, char color2, char color3) - This method returns a string with a number of vertical bars that correspond to the bars parameter. To compute the size of
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Financial Calculator: You will develop a program for a bank that will allow it to process loans for customers. The user will enter information, such as interest rate, length of loan, amount borrowed, or desired payment, and the program will compute the missing information. It will also be able to display a report showing the amortization schedule

( 3 5 % ) Consider the following C + + code, and answer the questions below. #include a , b , c , d d = 0 b = 2 c = 0 ( a % b = = 0 ) , c = 1 d + + c ; ( b { i f ( a % b = = 0 ) , c = 1 ; b + t ; } i f ( ! c ) d + + } cout ;
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Modify the countnodes function with a for loop, and the function should remain unchanged.
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Working software over comprehensive documentation?

in C languge Assignment Brief and Guidance Scenario You applied for an internship at a video game development company called Mintendo that is famous for producing small games for kids. As part of the hiring process, you are given a take-home assignment. The assignment is broken down into 6 tasks that you need to complete in order to be considered
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13. Insert a macro button next to your Add Leg to Itinerary button\ a. The label of this button should be Miles Used\ b. When pressed, a message box should pop up saying You have used XXX\ miles out of 350, where XXX is the distance in the named range dist.\ Hint: Create a new subroutine using the function MsgBox (prompt, [ buttons,\ ] [ title, ]

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