Decide whether the expression is or is not an identity.sin (A + 4?) = cos (A + ?)
A. Not an identity
B. Identity
Answer: A
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Use reference angles to find the exact value of the expression. Do not use a calculator.tan 
A. 
B. - 
C. 
D. 
Factor the expression completely, if possible.a3 - 12a2b + 36ab2
A. a(a + 6b)2 B. ab(a - 6)2 C. a(a - 6b)2 D. Does not factor
Solve the problem.The average value of a certain type of automobile was $13,080 in 1992 and depreciated to $5220 in 1997. Let y be the average value of the automobile in the year x, where x = 0 represents 1992. Write a linear equation that models the value of the automobile in terms of the year x.
A. y = -1572x + 5220
B. y = - 
x - 5220
C. y = -1572x + 13,080
D. y = -1572x - 2640
Solve the problem.In a sample of 70 widgets, 4 were defective. How many defective widgets would you expect in a sample of 420 widgets?
A. 27 widgets B. 22 widgets C. 24 widgets D. 54 widgets