Question

Jeff writes comic strips for local newspaper. The number of comic strips he created is represented by the function f(x)=3x, where f(x) gives the number of comic strips ans x is the number of work hours he put in, which varies day to day. If he puts in. 3,4,7,9 work hours, how many comic stris can he write?

Answer 1

If Jeff writes comic strips at a rate of 3 comics an hour then you must put 3,4,7&9 into the function and add up the products.
9+12+21+27=69