Answer:
4.5 is a rational number, as it can be represented as 9/2. Many important numbers in mathematics, however, are irrational, and cannot be written as ratios.
The sales tax is $7.67
In total, with the sales tax, the phone would be $92.65
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C - 7.6 = -4
c = -4 + 7.6
c = 3.6
