Find the length of the unknown side of the right triangle. In each case, a and b represent the lengths of the legs and c represents the length of the hypotenuse.
b = 9, c = 15; find a
A. 14
B. 12
C. 15
D. 11
Answer: B
Mathematics
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Find a polar equation in the form r cos(? - ?0) = r0 for the given line.x = -4
A. r cos 
= 4
B. r cos 
= 4
C. r cos ? = 4
D. r cos 
= 4
Mathematics
Express the number in scientific notation.29,000,000,000
A. 2.9 × 10-9 B. 2.9 × 109 C. 2.9 × 10-10 D. 2.9 × 1010
Mathematics
Find the exact value of the expression using a sum or difference identity.cos 255°
A. 
(
- 1)
B. - 
C. - 
(
- 1)
D. 
Mathematics
Solve the problem.Compute the instantaneous rate of change of the function at at x = a. 
A. 20 B. 35 C. 4 D. -20
Mathematics