Solve the problem.The time of a telephone call (in minutes) to a certain town is a continuous random variable with a probability density function defined by 
for
Find the probability: 
A. 0.000001
B. 0.000074
C. 0.000683
D. 0.000316
Answer: A
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Identify the slope and y-intercept of the line with the given equation.f(x) = -7x - 4
A. Slope -7, y-intercept (0, -4) B. Slope -4, y-intercept (0, -7) C. Slope -4, y-intercept (0, 7) D. Slope 7, y-intercept (0, -4)
Write fraction as a percent. If necessary, round the percentage to the nearest tenth.
A. 3.75% B. 0.0375% C. 0.375% D. 37.5%
Find the value of (f ? g)' at the given value of x.f(u) = 
- u, u = g(x) = ?x, x = 7
A. -7? B. 4 - ? C. 7? D. -?
A rocket is launched vertically upward with a speed 
. Take the upward direction as positive and let the mass be m. Assume that the only force acting on the rocket is gravity, which is inversely proportional to the square of the distance from the center of the earth. Let 
be the distance from the center of the earth at time, t. the correct differential equation
for the position of the rocket is
Select the correct answer.
?
A. 
B. 
C. 
D. 
E. none of the above