Divide and simplify.- 
A. - 
B. - 
C. - 
D. - 
Answer: A
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Solve the problem.The intensity L(x) of light x ft beneath the surface of a lake satisfies the differential equation 
. At what depth, to the nearest foot, is the intensity one tenth the intensity at the surface?
A. 26 ft B. 38 ft C. 13 ft D. 17 ft
Find v ? u.v = 
and u = 
A. 0
B. 
i - 
j
C. 
i
D. 
Solve the problem.In one study the maximum heart rates of conditioned athletes were examined. A group of athletes was exercised to exhaustion. Let x represent an athlete's heart rate five seconds after stopping exercise and y represent an athlete's heart rate ten seconds after stopping exercise. It was found that the maximum heart rate H for these athletes satisfied the following two equations. H = 0.491 x + 0.468 y + 11.2 H = -0.981 x + 1.872y + 26.4If an athlete had a maximum heart rate of H = 158, determine the value of y graphically to the tenths place.
A. y = 152.1 B. y = 151.4 C. y = 151.8 D. y = 147.7
Use a proportion to solve the problem.To determine the number of fish in a lake, a park ranger catches 240 fish, tags them, and returns them to the lake. Later, 72 fish are caught, and it is found that 20 of them are tagged. Estimate the number of fish in the lake.
A. 67 fish B. 864 fish C. 345,600 fish D. 6 fish