Determine which of the expressions is not equivalent to the given expression by the commutative and associative laws.x + (y + 23)
A. 23x + y
B. (x + y) + 23
C. (y + x) + 23
D. x + (23 + y)
Answer: A
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Simplify the expression. Use positive exponents. Assume variables represent nonnegative numbers.(-5x5)(3x4)
A. -15x9 B. 8x20 C. -15x20 D. 8x9
Graph the parabola or ellipse. Include the directrix that corresponds to the focus at the origin.r = 
A. 
B. 
C. 
D. 
Find the mode.The last eight televisions sold at a local electronics store cost $389, $363, $430, $363, $349, $389, $349, $363.
A. The mode is 363. B. The mode is 360.8. C. The two modes are 363 and 389. D. The mode is 389.
Solve the problem.A skydiver jumps from a plane at 16,400 ft. and deploys her parachute after 7 seconds of freefall. What is her altitude at the time she deploys her parachute?
A. 15,316 ft. B. 15,816 ft. C. 16,416 ft. D. 15,616 ft.