Subtract the polynomials. Assume all variable exponents represent whole numbers.(2x2n - 7xn - 19) - (9x2n - 5xn + 13)
A. -7x2n - 2xn - 32
B. -7x4n - 2x2n - 32
C. -7x2n + 2xn - 6
D. -7x2n - 2xn - 6
Answer: A
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Solve by completing the square.x2 + 3x - 9 = 0
A. 
B. -3 ± 3
C. 
D. 
Classify the system as either consistent or inconsistent.
A. Consistent B. Inconsistent
Solve the system by the addition method.-2x - 5y = -175x - 3y = -4
A. {(-1, 3)} B. {(1, -3)} C. {(1, 3)} D. {(-1, -3)}
Solve the problem.An experimental model for a suspension bridge is built in the shape of a parabolic arch. In one section, cable runs from the top of one tower down to the roadway, just touching it there, and up again to the top of a second tower. The towers stand 40 inches apart. At a point between the towers and 10 inches along the road from the base of one tower, the cable is 1 inches above the roadway. Find the height of the towers.
A. 4.5 in. B. 6 in. C. 3.5 in. D. 4 in.