Use a sum-to-product identity to rewrite the expression.cos 70° + cos 63°
A. 2(cos (66.5°) cos (3.5°))
B. 2(sin (66.5°) cos (3.5°))
C. 2(sin (3.5°) cos (66.5°))
D. 2(sin (66.5°) sin (3.5°))
Answer: B
Mathematics
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Find the limit using 
= 1.
A. 
B. does not exist
C. 
D. 0
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Solve the problem.The number of acres in a landfill decreases according to the functionB = 4300e-0.04t where t is measured in years. How many acres will the landfill have after 8 years? (Round to the nearest acre.)
A. 3122 acres B. 2128 acres C. 2058 acres D. 4900 acres
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Find the present value. Round to the nearest cent.
A. $7773.91 B. $2450.66 C. $2269.13 D. $1930.87
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Determine whether the statement is true or false.A fraction whose numerator and denominator are two different prime numbers cannot be simplified.
A. True B. False
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