Solve the problem.A plane flying with a tailwind flew at a speed of 470 mph, relative to the ground. When flying against the tailwind, it flew at a speed of 330 mph. Express these relationships as equations. Let x represent the speed of the plane in calm air and let y represent the speed of the wind.
A. x + y = 470
y = 330
B. x + y = 330
x - y = 470
C. x + y = 470
x - y = 330
D. x + y = 330
y = 470
Answer: C
Mathematics
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Solve the problem by integration.Find the volume generated by revolving the first-quadrant area bounded by 
and x = 3 about the y-axis.
A. 
? ln 900
B. 5? ln 900
C. 10? ln 4
D. 5? ln 4
Mathematics
Simplify the expression. Express the answer so that only positive exponents occur. Assume that all variables are positive.(9x1/5 ? y1/5)2
A. 81x1/10y1/10 B. 81x2y2 C. 81x1/25y1/25 D. 81x2/5y2/5
Mathematics
Factor the square of the binomial.x2 + 40x + 400
A. (x + 20)(x - 20) B. (x + 20)2 C. (x + 40)(x - 40) D. (x - 20)2
Mathematics
Simplify.
A. 
B. 
C. 1
D. 
Mathematics