The point P on the unit circle that corresponds to a real number t is given. Find the indicated trigonometric function.
?Find cot t.
A. 
B. 
C. - 
D. - 
Answer: C
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Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 1; local maximum at x = -1; concave down on (-?, ?) B. Local minimum at x = 1; local maximum at x = -1; concave down on (0, ?); concave up on (-?, 0) C. Local minimum at x = 1; local maximum at x = -1; concave up on (0, ?); concave down on (-?, 0) D. Local minimum at x = 1; local maximum at x = -1; concave up on (-?, ?)
Evaluate the expression using the given values.
; x = -12, y = 5
A. 
B. 13
C. 15
D. 17
Simplify the expression.
- 
A. 3
B. 
C. 
D. 0
Solve the problem.Sergio's internet provider charges its customers $7 per month plus 6¢ per minute of on-line usage. Sergio received a bill from the provider covering a 
period and was charged a total of $85.60. How many minutes did he spend on-line during that period? (Round to the nearest whole minute, if necessary.)
A. 496 min B. 96 min C. 446 min D. 960 min