Posted by matt on Wednesday, January 7, 2009 at 10:39pm.
The tread depth of the tires on your family's new car is 3/8 inch. you predict that, as a result of driving the car, the change in tire tread depth will be about 3/64 inch per year.
A. write a variable expression for the tire tread depth after y years of driving. Use your expression to make a table showing the tire tread depth after 1,2 an 3 years.
b. Tires should be replaced when the tread depth is 1/16 inch. extend your table from part (a) to find the approximate number of years the car can be driven before the tires need to be replaced.

math  Nancy, Wednesday, January 7, 2009 at 11:02pm
Y = 3/8 ((3/64)x) this is the variable expression.
just make y= 1/16 to find the number of years.
plug 1,2,3 into x to find the amount of tread left after each year.

math  Reiny, Thursday, January 8, 2009 at 8:42am
Nancy, you have a double negative, your equation would have the tread depth increase.
it should have been
depth = 3/8  (3/64)t where t is number of years.
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