Tires have tread on them to channel away water and improve grip on both wet and dry surface the height of the treads on tire is referred to as tread thickness the tsble shows the tread thickness of a particular set of truck tires bassd on the number of miles on those tires

miles tread thickness (mm)
15. 7.2

36 4.8

let’s continue on the assumption that tread thickness and miles driven are linearly related. find the rate at which the thickness is changing compared to thousands miles driven by comparing change in thickness to number of miles driven in thousands. what does this number describe about a line that can be used to model tread thickness.

use either one of the ordered pairs in the table to write the point slope form of the equation that describes the relationship between the tread thickness and the number of thousands of miles the tide has been used.

write the slope intercept form of the equation that describes the relationship between the tread thickness and the number of thousands of miles the tire has been used. you can either use the previous question or create a new equation from the data in the table

use your equation to predict the thread thickness when the tires have been used for 50,000 miles

according to the u. s department of transportation the minimum safe tread thickness is 1/16 in covert this thickness to millimeters then decide how many more miles the owner of these tires can drive before he risks life and limb driving on unsafe tires. (1in is about 25.4mm assume that the current number of miles is that later data in the table)