Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for an to find a20, the 20th term of the sequence.-3, 3, 9, 15, 21, . . .
A. an = 6n - 9; a20 = 111
B. an = 9n - 6; a20 = 174
C. an = 6n - 3; a20 = 117
D. an = 9n - 3; a20 = 177
Answer: A
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Use the given information to find the exact value of the trigonometric function.cos ? = 
, ? lies in quadrant IV
Find cos 
.
A. - 
B. - 
C. 
D. 
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