Answer:
It is an example of commutative property
Step-by-step explanation:
200 gallons
5/5-4/5=1/5
1/5=40 gallon
40x5=200 gallon
Part A: 1 solution
Part B:
4(3d −7) = −52
(4)(3d) + (4)(-7)= -52
12d + -28 = -52
12d - 28 = -52
12d - 28 + 28 = -52 + 28
12d = -24
12d/12 = -24/12
d = -2
:)