Find the missing factor.-6x8y3 = xy ? ?
A. x7y2
B. -6x9y4
C. -6x7y2
D. x9y4
Answer: C
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Find the first four terms of the indicated expansion.(x-2 + 2x)16
A. x-32 + 32x-30 + 480x-28 + 4480x-26 + . . . B. x-32 + 32x-29 + 15,360x-26 + 4480x-23 + . . . C. x-32 + 32x-29 + 480x-26 + 4480x-23 + . . . D. x-32 + 32x-20 + 480x-28 + 4480x-26 + . . .
Solve the problem.Mardi received an inheritance of $70,000. She invested part at 4% and deposited the remainder in tax-free bonds at 3%. Her total annual income from the investments was $2500. Find the amount invested at 4%.
A. $67,500 B. $39,000 C. $20,000 D. $40,000
Evaluate the following :
1. ? dx
2. 
3. 
The volume of a right-circular cylinder of radius r and height h is 
.
?
Suppose the radius and height of the cylinder are changing with respect to time t. At a certain instant of time, the radius and height of the cylinder are 6 and 3 in. and are increasing at the rate of 0.4 and 0.1 in./sec, respectively. How fast is the volume of the cylinder increasing?
?
A. 18 in3/sec B. 10.7 in3/sec C. 22.7 in3/sec D. 9.4 in3/sec