The total revenue function (in dollars) for a blender is 
, where x is the number of units sold. What is the average rate of change in revenue R(x) as x increases from 20 to 30 units?
?
A. $254.60 per unit
B. $59.80 per unit
C. $48.20 per unit
D. $49.80 per unit
E. $49.00 per unit
Answer: E
Mathematics
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Evaluate the expression without using a calculator.
?
A. 
B. 
C. 
D. 78125
E. -78125
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Round the money amount to the specified place.$31.58 to the nearest dollar.
A. $31.6 B. $40 C. $32 D. $31
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Write the statements Sk and Sk+1.Sn: 12 + 42 + 72 + . . . + (3n - 2)2 = 
What will be an ideal response?
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Solve the problem.The amount of simple interest I generated by principal P, annual interest rate r, and time t in years is given by 
Find the interest if t = 4 years, 
, and 
.
A. $33.60 B. $2.82 C. $0.40 D. $282.24
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