Simplify the expression.(x7)9 ? (x5)3
A. x156
B. x62
C. x78
D. x128
Answer: C
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Solve the problem. Round your result to an appropriate number of significant digits.A line from the top of a cliff to the ground passes just over the top of a pole 5.0 ft high and meets the ground at a point 6.0 ft from the base of the pole. If the point is 78 ft from the base of the cliff, how high is the cliff?
A. 0.40 ft B. 0.00 ft C. 70 ft D. 65 ft
Factor by grouping.5xy + 20x + 7y + 28
A. (5x + 4)(y + 7) B. (5x + 7)(y + 4) C. (5x + 7y)(y + 4) D. (5x + y)(7y + 4)
Find the x-intercept(s) of the graph of the equation. Graph the equation.y = x2 + 4x - 7
A. x-intercepts: -4 and 3
B. x-intercepts: none
C. x-intercepts: -2 ± 
D. x-intercept: 4
Decide on a suitable restriction on the domain so that the function is one-to-one and the range is not changed.f(x) = ?x - 16?
A. (-?, 15) B. [-16, 16) C. [16, ?) D. [-16, ?)