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. 16 ft
B. 49 ft
C. 22 ft
D. 33 ft
Answer: D
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Find the domain and the range of the relation.
A. domain: x ? 4; range: all real numbers B. domain: all real numbers; range: y ? 4 C. domain: all real numbers; range: all real numbers D. domain: all real numbers; range: y ? 4
Write and solve an equation to answer the question. Round your answer to the nearest tenth of a percent, if necessary.What percent of 59 animals is 546 animals?
A. 925.4% B. 92.5% C. 0.1% D. 1.1%
Solve the problem.A ball is thrown downward from a window in a tall building. Its position at time t in seconds is 
where s is in feet. How long will it take the ball to fall 149 feet?
A. 2.0 sec B. 4.8 sec C. 2.2 sec D. 3.1 sec
Solve.The amount of water used to take a shower varies directly as the amount of time that the shower is in use. A shower lasting 18 minutes requires 9 gallons of water. Find the amount of water used in a shower lasting 8 minutes.
A. 4.5 gallons B. 144 gallons C. 3.5 gallons D. 4 gallons