Use a half-angle formula to find the exact value of the expression.cos 
A. - 
B. - 
C. 
D. 
Answer: C
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Evaluate the sum.
A. 186 B. 172 C. 183 D. 169
Solve the problem.Find the range and the standard deviation of the following voltages (in volts) of a sample of watch batteries: 1.212, 1.199, 1.201, 1.202, 1.199, 1.198.
A. Range = 0.014 V; standard deviation = 0.0040 V B. Range = 0.013 V; standard deviation = 0.0039 V C. Range = 0.013 V; standard deviation = 0.0040 V D. Range = 0.014 V; standard deviation = 0.0052 V
Evaluate the algebraic expression under the given conditions.b2 - 4ac for a = 3, b = 4, and c = -8
A. 80 B. 112 C. -288 D. 36
Find the inverse. Determine whether the inverse represents a function.{(6, 3), (7, 4), (5, 5), (3, 6)}
A. {(4, 3), (6, 5), (6, 5), (4, 5)}; a function B. {(3, 6), (4, 7), (5, 5), (6, 3)}; a function C. {(4, 3), (3, 5), (6, 7), (4, 5)}; not a function D. {(3, 6), (4, 7), (5, 5), (6, 3)}; not a function