Use the principle of estimation to find an estimate for the calculation.192,561 ÷ 54
A. 4000
B. 40
C. 200
D. 2000
Answer: A
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Factor by grouping.18m - 2m2 + 81n - 9nm
A. m(2 + 9n)(9 - 1) B. No common factor C. (2m - 9n)(9 - m) D. (2m + 9n)(9 - m)
Solve the problem.In an aerobic exercise machine, weights are lifted and a person's hands are constrained to move along arcs of the ellipse 
If the person's hands move upward at 0.2 m/s and start at 
at what velocity is each moving after 2.5 s? Find the magnitude and direction of the velocity.
A. 0.27 m/s, 108° B. 0.21 m/s, 108° C. 0.21m/s, 72° D. 0.27 m/s, 72°
What property of multiplication is illustrated in the diagram below?
A. Associative property B. Distributive property C. Commutative property D. Multiplicative-identity property
Solve the system by using Gaussian elimination with backward substitution or by reducing the matrix to reduced-row echelon form. x + y + z = -3 x - y + 2z = -144x + y + z = -15
A. (-4, 4, -3) B. (-3, 4, -4) C. (-3, -4, 4) D. No solution