Question

Please help I need this complete

Answer 1

Answer:
`c-34=21`; 55 cups of lemonade.

Explanation:

We are given the amount sold and the amount leftover so we need to figure out how many cups were there at the start. Since you are subtracting the amount of cups you sold from the amount you start with and it equals an end amount, the cups can be modeled by the equation
`c-34=21` rather than
`21+c=34`.

Now to solve for c

`c-34=21\\`

add 34 to both sides

`c=55`