15 pizzas would cost $180.
Switching the hypothesis and conclusion of a conditional statement and negating both. For example, the contrapositive of "If it is raining then the grass is wet" is "If the grass is not wet then it is not raining." Note: As in the example, the contrapositive<span> of any true proposition is also true.
Therefore, the answer would be:
</span><span>If I don't spend money, then I don't have it.</span>
62 triangle a and 59 triangle b
