James needs to mix a 30% saline solution with a 60% saline solution to create 200 millileters of a 55.5% solution. How many millileters of each solution must James use? Answer: James must mix millileters of 30% solution and millileters of 60% solution. Question Help: Video 1 Video 2 Message instructor Submit Question Question 22 You need a 70% alcohol solution. On hand, you have a 325 mL of a 30% alcohol mixture. You also have 95% alcohol mixture. How much of the 95% mixture will you need to add to obtain the desired solution? You will need mL of the 95% solution Question Help: Video Message instructor Submit Question MacBook Pro Carson just retired, and has $800,000 to invest. A very safe Certificate of Deposit (CD) account pays 1.5%, while a riskler bond fund pays 7.5% in interest. Carson figures he needs $36,000 a year in interest to live on. How much should he invest in each account to make enough interest while minimizing his risk? $ at 1.5% at 7.5% Round answers to the nearest dollar. Question Help: Message instructor Submit Question MacBook Pro Question 24 An airplane flying with the wind takes 4 hours to travel a distance of 1200 miles. The return trip takes 5 hours flying against the wind. What is the speed of the airplane in still air and how fast is the wind blowing? Answer: The speed of the airplane in still air is miles per hour. The wind speed is miles per hour. Round your values to the nearest whole number. Question Help: Video Message instructor Submit Question MacBook Pro Question 25 At 5:00 am, here's what we know about two airplanes: Airplane #1 has an elevation of 44890 ft. and is descending at the rate of 750 ft/min. Airplane #2 has an elevation of 11090 ft. and is climbing at the rate of 550 ft/min. (1) Lett represent the time in minutes since 5:00 am, and let E represent the elevation in feet. Write an equation for the elevation of each plane in terms of t. plane #1: E(t)= plane #2: E(t) (2) At what time will the two airplanes have the same elevation? t= minutes after 5:00 am (3) What is the elevation at that time? feet Question Help: Message instructor Submit Question MacBook Pro Question 26 A northbound train and a southbound train meet each other on parallel tracks heading in opposite directions. The northbound train travels 12 miles per hour faster than the southbound train. After 2 hours, they are 272 miles apart. At what speeds are the two trains traveling? The northbound train is traveling The southbound train is traveling Question Help: Message instructor Submit Question mph. mph. MacBook Pro Question 27 Kaileika was on a long 344 mile road trip. The first part of the trip there was lots of traffic, she only averaged 27 mph. The second part of the trip there was no traffic so she could drive 58 mph. If the trip took her 7 hours, how long did she travel at each speed? In traffic she drove for hours hours. After the traffic cleared she drove for Question Help: Video Message instructor Submit Question MacBook Pro