Add. Do not use a number line except as a check.2.7 + (-6.9)
A. 9.6
B. -9.6
C. 4.2
D. -4.2
Answer: D
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Find the derivative of the function.f(t) = (3 - t)(3 + t3)-1
A. f '(t) = 
B. f '(t) = 
C. f '(t) = 
D. f '(t) = 
Determine whether the lines are parallel, perpendicular, or neither. 9x + 3y = 12 and 24x + 8y = 34
A. Perpendicular B. Neither C. Parallel
Sketch the graph and show all local extrema and inflection points.y = x + cos 2x, 0 ? x ? ?
A. Local minimum: 
; local maximum: 
Inflection points: 
and 
B. Local minimum: 
; local maximum: 
Inflection point: 
C. No local extrema.
Inflection point: 
D. Local minimum: (1.444, -0.246); local maximum: (0.126, 1.031)
Inflection points: (0.785, 0.393) and (2.356, 1.178)
First, use front-end rounding to round each number and estimate the answer. Then, find the exact answer.Julie bought a dress originally costing $95.64. When she brought the dress to the counter, the agent told her that it was discounted $9.56. What is the sales price for the dress?
A. Estimate: $90; exact: $85.64 B. Estimate: $10; exact: $9.56 C. Estimate: $90; exact: $86.08 D. Estimate: $90; exact: $76.08