Well, we need to turn -20 into zero to make it easier. -20’s opposite is 20. So, -20+20=0. Now, what do we add to 0 to get 36? 36, right? So, 0+36 is 36. Now add the numbers we previously added. 20+36=56. So, the number that should be add to -20 to get 36 is 56. Hope this helped!
explanation: h stands for hotdogs, p for pretzels, and d for drinks. c represents the total cost. each price next to the variable describes the profit per item.
