Evaluate the expression for the given replacement values. 21 - (y - z) for y = 6, z = 4
A. 19
B. 20
C. 31
D. 11
Answer: A
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Solve the problem.Two runners run around a circular track. The first runner completes a lap in 7 minutes. The second runner completes a lap in 16 minutes. If they both start at the same place and the same time and go in the same direction, after how many minutes will they meet again at the starting place?
A. 224 B. 112 C. 113 D. 23
Simplify the algebraic expression.2[-4(7x + 2) - 2(7x + 3)]
A. -84x - 2 B. -84x - 28 C. -84x - 4 D. -70x - 14
Find the center of mass of a thin plate covering the given region with the given density function.The region enclosed by the parabolas y = 72 - x2 and y = x2, with density ?(x) = x2
A. 
= 36, 
= 0
B. 
= 0, 
= 
C. 
= 0, 
= 36
D. 
= 0, 
= 72
Divide.(8x3 - 2x2 - 7x + 10) ÷ (4x + 5)
A. 2x2 + 2 B. x2 + 3x - 2 C. 2x2 - 3x + 2 D. x2 - 3x + 2