Well if you buy only 1 of each, it would cost you 7.85 in total. if you subtract that from 20, it equals 12.15.
you can also make it a linear equation if you want more or less than 1 fruit and or sandwich
s=sandwich
f=fruit
5.7f+2.15f=20
Check the picture below.
includes 2, notice, it doesn't go below 2 over the y-axis, and then it keeps on going up. So, the range is from +2 onwards.
It is proportional because it has a direct relationship.
D. 100/135 the rest of them equal 135%
A, because 59-56= 3.
Others are distributed on a larger scale. 11-6=5 for B, 6-0=6 for C, 8-1=7 for D