Posted by **Allyson** on Tuesday, November 16, 2010 at 3:15pm.

The table below shows the cost of renting a bike for a given amount of time, find the rate of change in cost with respect to time.

Table: Time: 1.75, 4, 7.

Cost( Dollars)4.375, 10, 17.5

Could one of the tutors please explain to me how to this?

Thanks :)

-Allyson

- 9th grade algebra math hw, help?(: -
**bobpursley**, Tuesday, November 16, 2010 at 4:16pm
first, find the "velocity function"

cost/time: 4.375/1.75; 10/4; 17.5/7

cost/time: 2.5; 2.5; 2.528 $/hr

Well, the rate of change between the first increment and the second is zero.

The rate of change for the second to last increment is (2.528-2.5)/(7-4)=.00933 $/hr/hr

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