Solve.A plane makes a 240-mile trip against a head wind in 1 hour and 30 minutes and returns, with a tail wind of the same speed, in 1 hour. What is the speed of the wind?
A. 80 mph
B. 200 mph
C. 40 mph
D. 160 mph
Answer: C
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Solve the problem.Students at Maple School earned $374 selling candles. They want to accumulate $2000 for a club trip. What percent of their goal has been reached?
A. 0.187% B. 5% C. 18.7% D. 50%
Solve the problem.A square with sides of length 92 is inscribed in a circle and circumscribed about another circle. What is the area between the circles?
A. 2116 B. 4232? C. 2116? D. 46?
Find all the second order partial derivatives of the given function.f(x, y) = x ln (y - x)
A. 
= 
; 
= 
; 
= 
= 
B. 
= 
; 
= - 
; 
= 
= 
C. 
= 
; 
= - 
; 
= 
= - 
D. 
= 
; 
= - 
; 
= 
= 
Find the product.(3y2 - 2y - 1)(y2 + 4y - 3)
A. 3y4 + 12y3 - 17y2 + 2y + 3 B. 3y4 + 10y3 - 17y2 + 2y + 3 C. 3y4 + 12y3 - 18y2 + 2y + 3 D. 3y4 + 10y3 - 18y2 + 2y + 3