Find the product. Be sure to indicate the units for the answer. Round approximate answers to the nearest tenth.
? 
? 
A. 2,441.5 in/min
B. 406.9 ft/min
C. 4,883.0 rev/min
D. 3,255.3 ft/min
Answer: B
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Find the maximum and minimum of the function f over the closed and bounded set S.f(x, y) = (x + y)2; S = {(x, y): 
+ 
? 1}
A. f(
, 
) = f(- 
, - 
) = 6; maximum. f(x, -x) = 0 for - 
? x ? - 
; minimum.
B. f(
, 
) = f(- 
, - 
) = 6; maximum. f(x, -x) = 0 for - 
? x ? 
; minimum.
C. f(
, 
) = 6; maximum. f(- 
, - 
) = 6; minimum.
D. f(
, 
) = 6; maximum. f(- 
, - 
) = -6; minimum.
Solve the problem.A driver wants to gauge the fuel efficiency of her vehicle at speeds of 30 mph and above. She notices that traveling at an average speed of 40 mph results in a rating of 40 mpg, where as at an average speed of 50 mph, her car rates 35 mpg. Find an equation to model the gas mileage y for an average speed of x mph.
A. y = 2x + 60
B. y = 2x + - 20
C. y = -
x + - 20
D. y = -
x + 60
Solve the problem.A package of weather instruments is propelled into the air to a certain altitude at which point a parachute opens and the package returns to the surface. The altitude y (in km) of the package as a function of the time t (in min) is given by 
. Find the vertical velocity of the package for 
min.
A. -1.4 km/min B. -0.87 km/min C. -1.1 km/min D. -0.95 km/min
Solve the system graphically.
A. (4, -3) B. (3, 1) C. (4, 3) D. (3, 4)