So the first answer is 65+50m because its 65 dollars for sign up PLUS 50 PER month. and 20+55m. The second question is saying that both the gyms have the same price, so I will say that its 50+ 20m for both. It represents the total cost of the gym membership that you have to pay. Hope this helped.
Multiplication property of equality can be used to solve: 
Step-by-step explanation:
First of all, lets define the multiplication property of equality
The multiplication property of equality states that if one side of an equation is multiplied with any number the other side is also multiplied with the number.
Given equations are:

By observing the equations we can see that only third equation has a fraction in it so it has to be multiplied with -2 for solution

Hence,
Multiplication property of equality can be used to solve: 
Keywords: Linear equation, properties
Learn more about linear equations at:
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Answer:
5
Step-by-step explanation:
13. Is 18
15. Is 86
17 is 5
19 is 15
21 is 24
23 is 29
The answer would be -1/6 or -0.166667