on the way there 56 mph way back 70 mph. Time it took 4.5 hrs. How long did it take to get back to were I started

This is a little math problem I've been stuck on for a while.

10/18/15

Cellular Service

The model E=-0.475a^2+37.0a-44.6 represents the annual expenditure for cellular service E (in $) for individuals a year old. Use the formula to determine the age(s) at which the average annual... more

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