Solve using the problem-solving strategy for systems of linear equations.Molly is training for a biathlon. Each weekend she bicycles and runs to prepare for the race. She cycles at a rate of 14 mph and runs at a rate of 3 mph. If she spends 8 hours bicycling and running and covers a total of 79 miles, how much time did she spend on each?
A. Bicycling: 3 hr
Running: 5 hr
B. Bicycling: 5 hr
Running: 5 hr
C. Bicycling: 6 hr
Running: 3 hr
D. Bicycling: 5 hr
Running: 3 hr
Answer: D
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Find the center of mass of a thin plate covering the given region with the given density function.The region bounded by the parabola y = 81 - x2 and the x-axis, with density ?(x) = 9x2
A. 
= 0, 
= 
B. 
= 0, 
= 
C. 
= 0, 
= 
D. 
= 
, 
= 0
Find the median of the list of data.7.7 hr, 6.7 hr, 2.9 hr, 6.9 hr
A. 2.9 hr B. 6.9 hr C. 6.7 hr D. 6.8 hr
Use a system of linear equations to solve the problem.A chemist needs 130 milliliters of a 68% solution but has only 36% and 88% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 55 mL of 36%; 80 mL of 88% B. 80 mL of 36%; 50 mL of 88% C. 55 mL of 36%; 75 mL of 88% D. 50 mL of 36%; 80 mL of 88%
Solve the absolute value equation.|9x| = 0
A. {
}
B. {9, -9}
C. {0}
D. {9}