The graph of y = f(x) is given. Use the graph to find the function value.Find f(-12).
A. -12
B. -8
C. 20
D. 0
Answer: D
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Solve.Find an equation of an ellipse with vertices (-3,0) and (3, 0) and eccentricity equal to 
.
What will be an ideal response?
Use logarithmic differentiation to find the derivative of y.y = x(x + 8)(x - 9)
A. 
+ 
+ 
B. x(x + 8)(x - 9)(lnx + ln(x + 8) + ln(x - 9))
C. x(x + 8)(x - 9)
D. 1
Choose the correct response.Suppose that x ounces of a 25% acid solution are mixed with y ounces of a 35% solution to obtain 71 ounces of a 32% solution. One equation in a system for solving this problem is 
Which of the following is the other equation?
A. 25x + 35y = .32(71) B. .25x + .35y = .32(71) C. 35x + 25y = 32 D. .35x + .25y = .32(71)
Solve the problem.Between 7:00 AM and 8:00 AM, trains arrive at a subway station at a rate of 10 trains per hour 
per minute). The following formula from statistics can be used to determine the probability that a train will arrive within t minutes of 7:00 AM. F(t) = 1 - e-0.17tDetermine how many minutes are needed for the probability to reach 60%.
A. 2.02 min B. 5.25 min C. 7.34 min D. 5.39 min