When two railroad tracks merge, the overlapping portions of the tracks are in the shapes of circular arcs (see figure). The radius of each arc r (in feet) and the angle ? are related by
?
?
Write a formula for x in terms of cos ?.
?
?
A. ?
B. ?
C. 
?
D.
?
E.
?
Answer: C
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Find the derivative of y with respect to x.y = 2 sin-1 (4x3)
A. 
B. 
C. 
D. 
Solve the problem.A standardized math test was given to 4000 students. The scores were normally distributed with a mean of 340 and a standard deviation of 60. How many students scored between 220 and 460?
A. 2720 B. 3800 C. 3992 D. 3900
Solve the problem.What is the domain of the sine function?
A. all real numbers, except odd multiples of 
(90°)
B. all real numbers, except integral multiples of ? (180°)
C. all real numbers from -1 to 1, inclusive
D. all real numbers
The graph of a certain function y = f(x) and the zero of that function is given. Using this graph, find a) the x-intercept of the graph of y = f(x) and b) the solution to the equation f(x) = 0.
A. a. 2.5 b. x = 0 B. a. 0 b. x = 2.5 C. a. -2.5 b. x = -2.5 D. a. 2.5 b. x = 2.5