Differentiate.
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Solve the problem.Suppose that the total profit in hundreds of dollars from selling x items is given by 
Find the marginal profit at x = 4.
A. $400 per item B. -$100 per item C. $600 per item D. -$800 per item
Write an equation for a sine curve that has the given amplitude and period, and which passes through the given point.Amplitude 
, period 5? , point (0, 0)
A. y = 
sin 
B. y = 
sin 
C. y = 
sin 5?x
D. y = 
sin 
Rationalize the denominator. Assume that all variables represent positive real numbers.
A. 5
B. 
C. 5
D. 
Find: a. The center and radius of the circle. b. The x- and y-intercepts of the graph of the circle.5x2 + 5y2 - 4y = 0
A. a. center = 
; radius = 
b. (0, 0), 
B. a. center = 
; radius = 
b. 
C. a. center = 
; radius = 
b. (0, 0), 
D. a. center = 
; radius = 
b. (0, 0)