Combine and simplify, if possible.-5y2 - 7x2

A. -12x2y2
B. -5x4y2 - 7x2y4
C. -5x2y2 - 7x2y2
D. 2x2y2

Answer: A

Mathematics

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Evaluate the integral.dx

A.  cot4 x sec x + C
B. -  cot2 x - ln  + C
C.  cot4 x + C
D.  cot2 x + ln  + C

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Mathematics

Factor when possible.x2 - 4xy - 21y2

A. (x - 3y)(x + y) B. (x + 3y)(x - 7y) C. (x - 3y)(x + 7y) D. Prime

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Mathematics

Find the area of a regular polygon with perimeter 42.8 inches and apothem 9.6 inches.

(a) 104.8 in² (b) 205.44 in² (c) 52.4 in² (d) 410.88 in²

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Mathematics

Which method should be used to solve the system? Explain your answer, including a description of the first step.x2 - y2 = 367x + y = -7

What will be an ideal response?

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Mathematics