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## Homework Statement

A student measures the length of a brass rod with a steel tape at 20.0°C. The reading is 80.00 cm. What will the tape indicate for the length of the rod when the rod and the tape are at each of the following temperatures?

a) -18.0°C

## Homework Equations

(delta)L=a*L*(delta)T.where a for brass is 19e-6, and steel is 11e-6

## The Attempt at a Solution

i sarted by finding the change in the increment of a cm on the steel tape using the the above equation and then finding the expansion for a cm of brass at the temperature. multipplied it by the original measurement, then added the resulting value to the measuremnt. however im not sure if this is right