The cost function for a certain model of personal digital assistant (PDA) is given by 
, whereC is measured in dollars andxis the number of PDAs produced. Write a model for the average cost per unit produced and also find the average costs per unit when ?x ?= 180 and ?x? = 1030. (Round your answer to two decimal places.)
?
A. 
?
B.
C.
D.
?
E.
?
Answer: D
Mathematics
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Integrate the function.
A. 
+ C
B. 
+ C
C. 
+ C
D. 
+ 
+ C
Mathematics
Evaluate the algebraic expression for the given value of the variable.
for x = 3
A. - 108 B. 12 C. - 12 D. 3
Mathematics
Solve.One week in April in the town of Simmons, it rained 0.61 inches on Monday, 2.52 inches on Wednesday, and 2.03 inches on Friday. It didn't rain the other four days. What was the total rainfall for the week?
A. 5.16 in. B. 4.96 in. C. 5.14 in. D. 5.06 in.
Mathematics
Graph.(y - 1)2 - (x + 1)2 = 4
A. 
B. 
C. 
D. 
Mathematics