Solve.A plane flying with a tailwind flew at a speed of 420 mph, relative to the ground. When flying against the tailwind, it flew at a speed of 310 mph. Graph the system to find the speed of the plane in calm air and the speed of the tailwind.
A. Speed of plane: 375 mph
Speed of tailwind: 45 mph
B. Speed of plane: 45 mph
Speed of tailwind: 375 mph
C. Speed of plane: 55 mph
Speed of tailwind: 365 mph
D. Speed of plane: 365 mph
Speed of tailwind: 55 mph
Answer: D
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Solve the problem.Find the average height of the paraboloid 
above the disk 
in the 
.
A. 153 B. 99 C. 66 D. 144
Let z vary jointly with x and y. Find the constant of variation k. Then, use 
to find z when x = 5 and y = 7.z = 69,020 when x = 58 and y = 119
A. k = 
; z = 350
B. k = 10; z = 350
C. k = 10; z = 120
D. k = 
; z = 120
Insert < or > to form a true sentence.
A. < B. >
Solve the problem.To remodel a bathroom, a contractor charges $25 per hour plus material costs, which amount to $3500. Therefore, the total cost to remodel the bathroom is given by 
where x is the number of hours the contractor works. Find a formula for 
What does 
compute?
A. f -1(x) = 
- 3500; This computes the total cost if the contractor works x hours.
B. f -1(x) = 
- 140; This computes the total cost if the contractor works x hours.
C. f -1(x) = 
- 3500; This computes the number of hours worked if the total cost is x dollars.
D. f -1(x) = 
- 140; This computes the number of hours worked if the total cost is x dollars.