The change is given by the difference between how much you paid and how much you actually had to pay. For example, if you pay with a $50 bill and you had to pay $13, your change will be $50-13 = 37$ dollars.

In this case, we have

$30 - (2.5x+2y-2) = 30-2.5x-2y+2 = 32-2.5x-2y$

So, Gabriel's mistake was to leave the negative sign to the "-2" at the end of the expression, instead of flipping it to positive "+2" when subtracting it.

7 0

2 years ago

What is 674×673×142÷3

anzhelika [568]

Step-by-step explanation:

$674 \times 673 \times 142 \div 3 \\ \\ = 674 \times 673 \times 142 \times \frac{1}{3} \\ \\ = 64,411,484\times \frac{1}{3} \\ \\ = 21,470,494.7 \\$

8 0

3 years ago