The distance between points (3,7) and (x1,y1) is the square root of (x1 - 3)2 + (y1 - 7)2
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For this case we have the following situation:
The monthly cost of a gym in the city is $ 3. The initial registration is $ 25. Write a mathematical expression that models the problem.
So we have to define variables:
x: number of months
y: total cost
The mathematical expression that models the problem is: