Solve.A polygon with n sides has D diagonals, where D is given by the function D(n) = 
. Find the number of sides n if 54 ? D ? 135.
A. {n|12 ? n ? 18}
B. {n|11 ? n ? 19}
C. {n|13 ? n ? 18}
D. {n|10 ? n ? 19}
Answer: A
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The circulation M, in thousands, of a magazine is a function of the time t in years since the beginning of 2000. The formula
?
?
is valid over the interval from 
to 
.A. Express in functional notation the circulation of the magazine in 2003, and then calculate that value.B. When did the circulation reach 136 thousand? Round your answer to the nearest whole number year.C. What was the maximum circulation, and when did that occur? Round both answers to the nearest whole number.
What will be an ideal response?
Solve the problem.For children aged 5 to 15 years, the number of hours watching cartoons per week can be estimated by the function 
where s is the age of the child. Find the domain of the function.
A. (-?, ?) B. [0.5, 16] C. [11, 16] D. [5, 15]
Solve.When making a telephone call using a calling card, a call lasting 3 minutes cost $1.00. A call lasting 11 minutes cost $2.60. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that relates the cost of a making a call, y, to the time x.
A. y = -0.2x + 1.6 B. y = 0.2x + 0.4 C. y = 5x - 14 D. y = 0.2x - 8.4
Find 
.
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, ?
What will be an ideal response?