Answer:
5. $1.50 6. 2 months 7. x=11; subtraction/division properties of equality
Explanation:
5. Divide 22.50/15 to find the unit price of the pepsi, or $1.50 a can
6. 24+6x=16+10x
get the variables on one side
24=16+4x
get the real numbers on one side
8=4x
divide by 4 to get x on its own
x=2. so 2 months
7. 1/2x+9=20
subtract 9 from both sides
1/2x = 11
divide each by 1/2 to get x on its own, and x=22 since 11 divided by one half is the same as multiplying it by two.