Multiply.(x + 9)(x - 9)
A. x2 - 18
B. x2 - 18x - 81
C. x2 + 18x - 81
D. x2 - 81
Answer: D
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Solve the problem.A vertical right circular cylindrical tank measures 
high and
diameter. It is full of oil weighing 
. How much work does it take to pump the oil to the level of the top of the tank? Give your answer to the nearest ft ? lb.
A. 5,428,672 ft ? lb B. 1,357,168 ft ? lb C. 2,714,336 ft ? lb D. 22,619 ft ? lb
Simplify.
A. 
B. -21
C. 11
D. 21
Perform the indicated operations graphically.( 2 - 2j ) - ( 2 + 2j )
A. 
a = 2 - 2j
b = -2 - 2j
c = (2 - 2j ) - (2 + 2j )
B. 
a = 2 - 2j
b = -2 - 2j
c = (2 - 2j ) - (2 + 2j )
C. 
a = 2 - 2j
b = -2 - 2j
c = (2 - 2j ) - (2 + 2j )
D. 
a = 2 - 2j
b = -2 - 2j
c = (2 - 2j ) - (2 + 2j )
Solve the problem.Evaluate 
at t = 
? for the function w(x, y, z) = 
; x = sin t, y = cost, z = t2.
A. 2
B. - 2
C. - 
D. - 2