Use a graphing calculator to solve the problem.Let f(x) = sin 
+ cos x on the interval I = (0, 7). Use the graph to estimate where f'(x) < 0 on I.
A. (0.51, 3.14)
B. (0, 5.77)
C. (0.51, 3.14) ? (5.77, 7)
D. (0, 0.51) ? (3.14, 5.77)
Answer: C
Mathematics
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Simplify the expression by using a sum or difference identity.cos (260°) cos (20°) + sin (260°) sin (20°)
A. 
B. - 
C. - 
D. 
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For the pair of functions, find the indicated domain.f(x) = 
, g(x) = 2x + 10Find the domain of f ? g.
A. [0, ?) B. [-5, ?) C. (-?, ?) D. (-?, -5] ? [0, ?)
Mathematics
Answer the following statement(s) true (T) or false (F)
The phrase "number sense" is synonymous with "ability to compute accurately."
Mathematics
Translate the phrase into a division problem. Then find the quotient.What is 3825 plus 511 plus 70?
A. 4306 B. 4416 C. 4406 D. 4343
Mathematics