Exercise 30 Page 144

We can model the total cost of the flyers by using a linear function, since the total cost increases by $0.15 per flyer. 15 Cents = $ 0.15This 0.15 increase means that the first differences are all equal. Now, we can write a function that models the total cost. Let x be the number of flyers and y be the total cost. Then, we can write the following. y=0.15 x+25 Here, 0.15 is the cost of a flyer in dollars and 25 is the set up fee in dollars. To find the total cost of 30 flyers, we need to substitute 30 for x.

y=0.15x+25

Substitute

x= 30

y=0.15( 30)+25

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Evaluate right-hand side

Multiply

Multiply

y=4.5+25

AddTerms

Add terms

y=29.5

Thus, 30 flyers cost $29.50.