2(pi)r
2(pi)0.75
Circumference is 4.71.
multiply 40 by 30% to find the discount then subtract
40 * 0.30 = 12
40-12 = 28
they would cost $28
The median is of this set of data is 67
The practical rule would be, times that number, by the result of the first time you multiplied the first number. But, it would all depend by how much your're raising the number by.
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But, once again, this was an example. This would show and illustrate the rule of "raising a power".<span />