Factor.81x2 + 36xy + 4y2
A. (81x + y)(x + 4y)
B. (9x + 2y)(9x - 2y)
C. (9x - 2y)2
D. (9x + 2y)2
Answer: D
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Evaluate the expression for the given replacement values. Write the answer in simplest form.xy for x = 
, y = 
A. 
B. 
C. 
D. 
Solve the problem.Car A (travelling north at 70 mph) and car B (traveling west at 40 mph) are heading toward the same intersection. Car A is 5 miles from the intersection when car B is 6 miles from the intersection. . Find a formula for the distance between the cars as a function of time, using the parametric equations that describe the motion of cars A and B. Using a graphing utility, find the minimum distance between the cars. When are the cars closest?
A. d = ; 2.73 mi; 5.45 min
B. d = ; 431.77 mi; 5.45 min
C. d = ; 2.73 mi; 0.09 min
D. d = ; 2.73 mi; 5.45 h
Perform the indicated operation. Don't forget to simplify if possible. Subtract 6x + 3 from 4x - 15
A. 10x - 12 B. -2x + 12 C. 2x + 18 D. -2x - 18
Use a double integral to find the area of the region bounded by the graphs of 
.
?
A. 
B. ?
C. ?
D. ?
E. ?