Use the graph of a quadratic function to find the solution set of the equation or inequality. For a solution set that involves an interval, use interval notation.-x2 + 8x - 16 > 0
A. (-?, ?)
B. x = 4
C. ?
D. (-?, 4) ? (4, ?)
Answer: C
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Write the word phrase as an algebraic expression. Use x to represent the unknown number.Seven times a number, decreased by 8
A. 7(x - 8) B. 7(x + 8) C. 7x + 8 D. 7x - 8
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 are both 12.25 inches tall and stand 70 inches apart. At some point along the road from the lowest point of the cable, the cable is 1.96 inches above the roadway. Find the distance between that point and the base of the nearest tower.
A. 21.2 in. B. 13.8 in. C. 21 in. D. 14.2 in.
Find all solutions of the equation in the interval [0, 2?).cos2 x - 1 = 0
A. 
B. {0}
C. {0, ?}
D. 
Add.6 + (-3) + (-22)
A. -19 B. 25 C. -13 D. 31