First, use front-end rounding to round each number and estimate the answer. Then, find the exact answer.Sheri wanted to know the total number of hours she worked this week. Her time card indicated the following hours: Monday, 5.81 hours; Tuesday, 9.5 hours; Thursday, 5.47 hours. How many hours has Sheri worked?
A. Estimate: 20 hours; exact: 20.78 hours
B. Estimate: 21 hours; exact: 21.78 hours
C. Estimate: 19 hours; exact: 21.78 hours
D. Estimate: 21 hours; exact: 20.78 hours
Answer: D
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Solve the equation.
+ 
= 
A. 
B. ?
C. 
D. 
Use the Intermediate Value Theorem to determine whether the polynomial function has a real zero between the given integers.f(x) = -2x4 - 4x3+ 8x + 2; between 1 and 2
A. f(1) = -4 and f(2) = 46; yes B. f(1) = -4 and f(2) = -46; no C. f(1) = 4 and f(2) = 46; no D. f(1) = 4 and f(2) = -46; yes
Solve for the specified variable. Assume that all other variables are nonzero.x2 - 3cx - 88c2 = 0; for x
A. x = ± 
B. x = ± 
C. x = -8c, 11c
D. x = 8c, -11c
Multiply.(-8 + x)(3x - 6)
A. 3x2 + 48x - 30 B. x2 - 30x - 30 C. 3x2 - 30x + 48 D. 3x2 - 31x + 48