Emily paid $3.84 in sales tax on an item that cost $64.00 before tax. At that rate, how much would be paid in sales tax for an item that cost $82.00?

8% tax rate & $ 4.40

Step-by-step explanation:

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The speed of one jet is ' r ' miles per hour, and the speed of the other one
is ' 2r ' miles per hour.  They're flying exactly away from each other, so the
space between them is increasing at the rate of  ' 3r ' miles per hour.

After 3 hours, the distance between them is

                   (3r miles/hour) x (3 hours) = 9r miles.