A pound of chocolate costs $7. Charlie buys p pounds. Write an equation to represent the total cost c that Charlie pays.

c=7p

Step-by-step explanation:

Each pound costs $7. If we were to buy 1 pound, it would be $7, 2 pounds: $14, 3 pounds, $21. Therefore, 7 is being multiplied by the number of pounds to find the cost.

7 multiplied by pounds, p, is:

7p

And the expression above is equal to the total cost, c, so our equation is

c=7p