Hello can you please help me answer this math homework questions & show all of the work please

Solve the system by substitution. If the system is inconsistent or has dependent equations, say so.

2x - 4y = - 16;

x + 2y = 20

Use the elimination method to solve the following system of equations

5x + y = 3

7x - 3y = - 31

Solve the system .

2x - 6y + 5z = -7

x + 4y - 6z = 13

x - 2y - 8z =-29

Solve the system .

3x - 8y + 5z = 2

x + 5y - 2z = 20

x - 4y - 4z = -9

A waitress sold 12 nbeye steak dinners and 33 grilled salmon dinners, totaling $578.22 on a particular day. Another day she sold 30 ribeye steak dinners and 11 grilled salmon dinners, totaling $584.16. How much did each type of dinner cost?

How many pounds of candy that sells for $0.83 per Ib must be mixed with candy that sells for $1.29 per lb to obtain 7 lb of a mixture that should sell for $0.96 per Ib?

$0.83-per-Ib candy: ____ Ib

(Type an integer or decimal rounded to two decimal places as needed.)

$1.29-per-lb candy: ____ Ib

Write the expression with only positive exponents. Assume that all variables represent nonzero real numbers.

6x^-3

Write the expression with only positive exponents. Assume all variables represent non-zero numbers.

-n^-7

Write the following expression with only positive exponents. Assume that the variable represents a non-zero real number.

(-2x)^-4

Apply the quotient rule for exponents, if possible, and write the result using only positive exponents.

5^-4/5^7

Use one or more power rules to simplify the expression. Assume all variables represent non-zero numbers.

(-3a^4/b)^5

Simplify the expression so that no negative exponents appear in the final result. Assume all variables represent nonzero

real numbers

(8a^-4)^3 (a^3)-3

Simplify the expression so that no negative exponents appear in the final result. Assume that all variables represent nonzero real numbers.

(5uv)v^2/40u^3v^9

Simplify so that no negative exponents appear in the final result. Assume all variables represent nonzero numbers.

(2p/q^2)^3 (3p^8/q^-8)

A country's national debt is approximately $10,200,000,000,000. Write 10,200,000,000,000 in scientific notation.

Write the number in scientific notation.

0.000000817

Subtract - 5x^2+ 2x + 8 from 6x^2 - 5x + 4.

Find the product.

m(m + 5) (m -8)

Multiply the polynomials.

(3m + 2) (8m^2- 12m +1)

Divide.

16y^2+8y-12/4y

Divide.

24x^3-60x^2-84x-24/8x+4

Divide.

(X^3+4x-16)/(x-2)