It is 1 because a penny is worth 1 cent.
The number 0 is basically nothing, so 7 divided by nothing is not defined. That's why calculators or even the most powerful computer can't divide anything by 0
Answer:
NOT a relation and NOT a function
0.17/30 = x/450 <em>Use proportion</em>
76.50 = 30x <em>Cross multiply</em>
2.55 = x <em>Divide 30 both sides</em>
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7.5 minutes call would cost 2.55
