Evaluate the expression for the given replacement values.2x + y
for x = 8 and y = -9
A. 25
B. -1
C. 7
D. 17
Answer: C
Mathematics
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Identify the equation as either an identity or not.2 cos 5x sin x = sin 6x + sin 4x
A. Not an identity B. Identity
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Solve the problem.A cashier has a total of 120 bills, made up of fives and tens. The total value of the money is $870. How many ten-dollar bills does the cashier have?
A. 27 B. 66 C. 54 D. 81
Mathematics
Find the exact value of the expression, if possible. Do not use a calculator.cos-1 
A. - 
B. 
C. 
D. 
Mathematics
Find the intervals over which the given function is increasing, is decreasing, or is constant.f(x) = 4
A. constant on (-?, ?) B. decreasing on (-?, ?) C. constant on (-4, 4) D. increasing on (-?, ?)
Mathematics