9.
no
he has to put -484 to the left of the equal sign too
z + 484 -484 = 964 - 484
z = 480
10.
a.
310,000 + x = 465,000
x = 465,000 - 310,000
x = 155,000
b.
310,000x = 930,000
x = 930,000 ÷ 310,000
x = 3
