You owe some friends $25 and pay them back $18. which number sentence shows this situation?

25 + 18
-25 + 18
-18 + 25
-25 + (-18)

If you would like to know which number sentence shows the following situation, you can find this like this: 

$25 - $18 = $7

You still owe your friends $7.
The correct result would be 25 - 18 = - 18 + 25.

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.