Solve the problem.An airplane flies 420 miles with the wind and 320 against the wind in the same length of time. If the speed of the wind is 40 mph, what is the speed of the airplane in still air?

A. 296 mph
B. 286 mph
C. 128 mph
D. 301 mph

Answer: A

Mathematics

Find the arc length parameter along the curve from the point where t = 0 by evaluating r(t) = (etcos t)i + (etsin t)j + 8etk

A. e^t -
B. e^t -
C. e^t -
D. e^t -

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Mathematics

Determine if the ordered pair is a solution of the equation. Remember to use alphabetical order for substitution.(4, 4); 5x + 2y = 28

A. No B. Yes

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Mathematics

Choose the graph of the equation.z = x4 - 2x2 + y2 -

A.

B.

C.

D.

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Mathematics

Perform the indicated operation.(9y6 - 3y5 + 7y4 + 2) -

A. 7y6 - 10y5 + 16y4 - 4 B. 7y6 + 4y5 - 2y4 + 8 C. 11y6 + 4y5 - 2y4 + 8 D. 11y6 + 4y5 - 2y4 - 4

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Mathematics