Solve the problem.If f(?) = cos ? and f(a) = 
, find the exact value of f(-a).
A. 
B. 
C. - 
D. - 
Answer: B
Mathematics
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Insert a decimal point in the product.441.07 × 10 = 441070
A. 44,107.0 B. 441,070. C. 4410.70 D. 441.070
Mathematics
Solve the problem.A radio station claims that the amount of advertising per hour of broadcast time has an average of 15 minutes and a standard deviation equal to 1.6 minutes. You listen to the radio station for 1 hour, at a randomly selected time, and carefully observe that the amount of advertising time is equal to 8 minutes. Calculate the z-score for this amount of advertising time.
A. 4.38 B. 0.43 C. -11.2 D. -4.37
Mathematics
Find the product.(w - 15)2
A. w + 225 B. 225w2 - 30w + 225 C. w2 + 225 D. w2 - 30w + 225
Mathematics
Find the least common multiple of the numbers.20 and 30
A. 300 B. 200 C. 600 D. 60
Mathematics