Solve the problem.The total profit (in hundreds of dollars) from selling x items is given by 
Find the marginal average profit function.
A. 
hundreds of dollars per item
B. 
hundreds of dollars per item
C. 
hundreds of dollars per item
D. 
hundreds of dollars per item
Answer: B
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Provide an appropriate response.If r(t) is the rate of change of sales, then 
isi) the total sales up to time b.ii)the total sales from time a to time b.iii) the change in sales at any time.
A. Only ii is correct. B. Only iii is correct. C. Both i and ii could be correct. D. Only i is correct.
Evaluate the integral.
A. 
B. 
C. 
D. 
Determine whether the given value of x is a solution to the quadratic inequality.x2 + 2x < 3; x = -2
A. Yes B. No
Find the focus and the directrix of the parabola.y = 3x2 + 18x + 29
A. Focus: 
; directrix: y = 
B. Focus: (-3, 5); directrix: x = -1
C. Focus: 
; directrix: y = 
D. Focus: (-3, 14); directrix: x = 10