Write the rational expression in simplest form.
?

?

A.
B. ?
C. ?
D. ?
E. ?

Answer: A

Mathematics

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Solve the problem.A plane flies 420 miles with the wind and 350 miles against the wind in the same length of time. If the speed of the wind is 22 mph, what is the speed of the plane in still air?

A. 232 mph B. 242 mph C. 247 mph D. 267 mph

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Determine whether the function satisfies a Laplace equation.f(x, y) = cos x sin(-y)

A. Yes B. No

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Find the exact value of the expression.cos  cos  - sin  sin 

A. 0
B. 1
C. -1
D.

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Factor completely. If unfactorable, indicate that the polynomial is prime.x2(x + 4) + 4x(x + 4) - 5(x + 4)

A. (x + 4)(x + 1)(x + 5) B. (x - 1)(x - 5)(x + 4) C. (x - 1)(x + 5)(x + 4) D. (x + 4)(x + 1)(x - 5)

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