Which item can woovis buy with the $5 bill that will give the most change?
here's the chart:
kibble $1.79
mouse crumbs $1.39
table scraps $2.49
crumbs & cheese $3.19
deluxe scraps $3.79

Knowing what the phrase "MOST change" means will help us quite a bit. 

Most means the highest amount. Change means what is left over. So what we are doing is taking $5 and subtracting it by all our values. Whatever has the greatest mount left over is the answer. 

$5.00 - $1.79 = $3.21 
$5.00 - $1.39 = $3.61 <
$5.00 - $2.49 = $2.51
$5.00 - $3.19 = $1.81
$5.00 - $3.79 = $1.21

So our answer is the Mouse Crumbs, because it leaves us with the greatest amount of change. 

Another tip for these problems. Is the one with the lowest price is the one that will have the highest amount of change. That's simply because you are subtracting the price from your total so if the number your subtracting is smaller then you'll have more left over. 

Hope I helped!

6(2x + 5y)6 (2x) = 12x6 (5y) = 30y12x + 30y