9th grade algebra math hw, help?(:
posted by Allyson on .
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

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 (2.5282.5)/(74)=.00933 $/hr/hr