Find the exact value of the expression.cos 1680°
A. 
B. - 
C. - 
D. - 
Answer: D
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Use the zero-exponent rule to simplify the expression.(-12)0
A. -12 B. -1 C. 0 D. 1
Write the expression in simplest form. If a radical appears in the denominator, rationalize the denominator.
A. xy
B. xy
C. xyz
D. x
Decide if the answer is reasonable or unreasonable by rounding the numbers and estimating the answer. If the answer is not reasonable, find the correct answer.75.13 ÷ 22.8 = 0.33
A. Unreasonable, should be 33 B. Unreasonable, should be 0.033 C. Reasonable D. Unreasonable, should be 3.3
Use a graphing calculator to solve the linear equation.The graph of y1 is shown in the standard viewing window. Which is the only choice that could possibly be the solution of the equation y1 = 0? 
-30, - 
, 
, 30
A. - 
B. -30
C. 
D. 30