Hl! the cost of cheese varies directly with the number of pounds bought. if 2 pounds cost $8.40, find the cost of 3.5 pounds. a. $12.50 c. $14.25 b. $10.75 d. $14.70

If 2 pounds cost $8.40, your number sense tells you 1 pound costs half as much, or $4.20.

Then 3.5 pounds will cost 3.5 times as much:
   3.5 × $4.20 = $14.70

The appropriate choice is
   d. $14.70


You can do this one in your head if you take it a step farther and consider the cost of 1/2 pound of cheese. That will be $2.10. Then 3.5 pounds is 7 half-pounds, so the cost will be 7 × $2.10 = (7×$2) + (7×0.10) = $14 + .70.

There’s not picture?