Use half-angle identities to find the exact value of the expression.cos 
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. 
A. 0 B. -12 C. 1 D. -4
Mathematics
Factor the trinomial.z2 - 2z - 80
A. (z + 8)(z - 10) B. (z - 80)(z + 1) C. (z - 8)(z + 10) D. (z - 8)(z - 10)
Mathematics
Perform the indicated operation and round as indicated.178.52 ÷ 8.9 hundredths
A. 20.06 B. 20.56 C. 2.01 D. 2.06
Mathematics
Write the decimal as a fraction or mixed number in lowest terms.785.1931
A. 78
B. 7851
C. 785
D. 78519
Mathematics