Andrew buys books and videos in a store. He uses the expression 4b + 8v to find the cost of what he is buying, where b is the number of books and v is the number of videos he buys. Use the expression to find the total cost of 3 books and 7 videos. Total cost =

68

Step-by-step explanation:

1) Plug In (when you plug in you replace the defined variable with the number given. usually you have to find the numbers to plug in but since they're already given to you you just plug them in.) 4 (3) + 8 (7) = T T = total cost

2) Multiply 4*3=12 8*7=56

3) Add 12+56=68

4) T=68