Georgie joins a gym. she pays $25 to sign up and then $15 each month. Create an equation using this

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Georgie joins a gym. she pays $25 to sign up and then $15 each month. Create an equation using this information.

Let m be the number of months Georgie uses the gym. Our equation G(m) is the cost Georgie pays for m months.
G(m) = Variable Cost * m (months) + Fixed Cost

Plug in our numbers:
G(m) = 15m + 25