Multiply.m(9 + m2)(9 - m2)
A. 81m - m5
B. 81m - 18m2 - m4
C. 81 + 18m - m2
D. 18m - m5
Answer: A
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Solve the problem.Find the center of mass of the region of constant density bounded by the paraboloid 
and the xy-plane.
A. 
= 0, 
= 0, 
= 27
B. 
= 0, 
= 0, 
= 3
C. 
= 0, 
= 0, 
= 
D. 
= 0, 
= 0, 
= 
Determine whether the study involves selection bias, participation bias, both selection bias and participation bias, or neither.You are interested in the percentage of people in your city who favor tax cuts. You interview every twentieth person as they leave the church in your neighborhood.
A. Participation bias and selection bias B. Selection bias C. No bias D. Participation bias
Perform the indicated operations, expressing the answer in simplest form with rationalized denominators.
A. 
B. 
C. 
D. 1
Find the quotient.
÷ 
A. 
B. 4u2v3(v + 2)
C. 
D. 