Solve the problem.A hamburger shop sells hamburgers with cheese, relish, lettuce, tomato, onion, mustard, or ketchup. How many different hamburgers can be made using any 5 of the extras?
A. 2520
B. 42
C. 21
D. 1260
Answer: C
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Solve.If an object is propelled upward from a height of 80 feet at an initial velocity of 64 feet per second, then its height, h, after t seconds is given by the equation 
, where h is in feet. After how many seconds will the object reach a height of 144 feet? (Round your answer to the nearest tenth, if necessary.)
A. 1 sec B. 4 sec C. 8 sec D. 2 sec
Find the inverse of the function, and state the domain and range of the inverse function.f(x) = 7 sin (3x) for - 
? x ? 
A. f-1(x) = 
sin-1 
; domain = [-7, 7]; range = 
B. f-1(x) = 
sin-1 
; domain = [-7, 7]; range = 
C. f-1(x) = 
sin-1 
; domain = [-7, 7]; range = 
D. f-1(x) = 
sin-1 
; domain = [-7, 7]; range = 
Find the greatest common factor of the monomials.4x2 and 24
A. 4x2 B. 4x C. 6 D. 4
Solve the problem.The speed of a stream is 5 mph. If a boat travels 60 mi downstream in the same time that it takes to travel 30 mi upstream, what is the speed of the boat in still water?
A. 18 mph B. 17 mph C. 15 mph D. 10 mph