Use a system of linear equations to solve the problem.Molly is training for a biathlon. Each weekend she bicycles and runs to prepare for the race. She cycles at a rate of 12 mph and runs at a rate of 5 mph. If she spends 6.5 hours bicycling and running and covers a total of 57 miles, how much time did she spend on each?
A. Bicycling: 3.5 hr, Running: 5 hr
B. Bicycling: 3.5 hr, Running: 3 hr
C. Bicycling: 4.5 hr, Running: 3 hr
D. Bicycling: 3 hr, Running: 3.5 hr
Answer: B
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A. It is an efficient algorithm, and it always gives the minimum spanning tree. B. It is an efficient algorithm, but it doesn't always give the minimum spanning tree. C. It is an inefficient algorithm, and it never gives the minimum spanning tree. D. It is an inefficient algorithm, but it always gives the minimum spanning tree. E. none of these
Use the square root property to solve the quadratic equation.7x2 = 11
A. 
B. ± 
C. 
D. ± 
Find the indicated matrix.Let B = [-1 6 4 -3]. Find -2B.
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A. sin 2 x + 1 B. - cos x C. sin x + 1 D. sin x - 1