# Expression miles driven in range with cost

• Mar 9th 2008, 12:43 PM
@chung
Expression miles driven in range with cost
Hi,
I have a Math problem below really stretches beyond my linear math algebraic equation (y=mx +c) understanding of 2 sets of specific number data. The problem, given a range of data verses another set of specific number. Please help if you have the solution. Many thanks and appreciate.

Cassidy rented a truck to move 120 miles from Ithaca to Attica. The table shows the cost for renting the truck based on the number of miles driven.
Miles driven Cost (\$)
0-9 25
10-19 31
20-29 37
30-39 43
40-49 49
Write an expression to determine the cost of renting the truck for m miles.
• Mar 11th 2008, 06:29 PM
topsquark
Quote:

Originally Posted by @chung
Hi,
I have a Math problem below really stretches beyond my linear math algebraic equation (y=mx +c) understanding of 2 sets of specific number data. The problem, given a range of data verses another set of specific number. Please help if you have the solution. Many thanks and appreciate.

Cassidy rented a truck to move 120 miles from Ithaca to Attica. The table shows the cost for renting the truck based on the number of miles driven.
Miles driven Cost (\$)
0-9 25
10-19 31
20-29 37
30-39 43
40-49 49
Write an expression to determine the cost of renting the truck for m miles.

When you graph this I would consider the center of each mileage interval. So we have the set of points
(5 miles, \$25)
(15 miles, \$31)
etc.

Notice that the price goes up \$6 for every additional 10 miles.

-Dan