The letters r and ? represent polar coordinates. Write the equation using rectangular coordinates (x, y).r = cos ?
A. x2 + y2 = y
B. (x + y)2 = y
C. (x + y)2 = x
D. x2 + y2 = x
Answer: D
Mathematics
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The graph of a function f is given. Use the graph to answer the question.What is the y-intercept?
A. (0, -15) B. (0, 17.5) C. (0, -20) D. (0, 25)
Mathematics
The probability density function of X is 
over [0, 2] . Compute each of the following.
(a) E ( X ) (b) SD(X )
Mathematics
Simplify by first writing the expression in radical form.361/4 ? 36- 3/4
A. 
B. 
C. 6
D. - (
)3
Mathematics
Solve.
+ 
= 1
A. 5
B. 35
C. 
D. 11
Mathematics