Factor completely.16x2 + 81
A. (4x - 9)2
B. prime
C. (4x + 9)(4x - 9)
D. (4x + 9)2
Answer: B
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For the given rectangular equation, write an equivalent polar equation.2x + 3y = 6
A. 2 sin ? + 3 cos ? = 6r B. r(2 cos ? + 3 sin ?) = 6 C. 2 cos ? + 3 sin ? = 6r D. r(2 sin ? + 3 cos ?) = 6
Look for a pattern and then predict the general term, or nth term, an, of the sequence.
, 
, 
, 3, 
, . . .
A. an = 
B. an = 
C. an = 
D. an = 
A drug is carried into an organ of volume 
cm3 by a liquid that enters the organ at the rate of p cm3/sec and leaves it at the rate of q cm3/sec. The concentration of the drug in the liquid entering the organ is r g/cm3. If the concentration of the drug in the organ at time 
is increasing at the rate of
?
?g/cm3/sec, and the concentration of the drug in the organ initially is 
g/cm3, find the concentration of the drug in the organ at time 
.
?
A. 
B. 
C. 
D. 
Solve the equation.(x - 4)(4x + 12) = 0
A. -4, 3
B. - 
, 
C. - 
, 
D. -3 , 4