AB = 36 cm
BC = 28 cm
Since they are similar figures:
36/28 = 9/EF
36EF = 28*9
EF = 252/36 = 7 cm
Finding the area:
Area = 1/2 * DE * EF
Area = 1/2 * 9 * 7
Area = 31.5 cm^2
Well, we want to find how much it would cost for 1 gallon, the easiest way to do that is subtract 21 from 18.
21 - 18 = 3
So, it's 3 dollars per gallon. Now that we know that we multiply it by 8 to find how much it would cost.
8 x 3 = 24
Eight gallons of gas would cost 24$ :D


she has $60 left.

she can afford 3 more months of her gym membership.
6 x (-3) = -18
6 + (-3) = 3
The numbers are 6 and -3