Factor completely, if possible.y2 - 81
A. (y + 81)(y - 81)
B. (y - 9)(y - 9)
C. (y + 9)(y - 9)
D. (y2 + 9)(y2 - 9)
Answer: C
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Provide the proper response.Write a problem that includes last year's sales, this year's sales, and asks for the percent of decrease. Explain how to identify the base, rate, and part in your problem.
What will be an ideal response?
Find the exact value of the expression if ? = 30°. Do not use a calculator.f(?) = cos ?Find 7f(?).
A. - 
B. 
C. - 
D. 
Solve the quadratic inequality if possible. Round your answer to the nearest tenth, if necessary.x2 - 9x > 2
A. All real numbers satisfy this inequality. B. approximately -0.2 < x < 9.2 C. approximately x < -0.2 or x > 9.2 D. No real number satisfies this inequality.
Find the length and direction (when defined) of u × v.u = 4i + 3j - 4k, v = -8i - 6j + 8k
A. 
; 
(-4i - 3j + 4k)
B. 
; 
(-4i - 3j + 4k)
C. 0; -4i- 3j + 4k
D. 0; no direction