According to your drawing it is distributive property Example a (b+c) = a b + a c Full description of that property is Multiplication is distributive to addition In your case 2q+5 is in role of a but 6 and 5 in roles b and c
First you take the original set and subtract it by the sale set. After that you take you new answer and divide it by the original and you will get a percent that you can round too
