To find the regular cost per month \( m \) for Spencer's gym membership, we need to account for the total cost he paid and the discount he received for prepaying.
- The total cost without the discount for 12 months would be \( 12m \).
- Since Spencer received a discount of $25, his effective total payment is \( 12m - 25 \).
- We know that Spencer paid a total of $335.
Therefore, we can set up the equation:
\[ 12m - 25 = 335 \]
To solve for \( m \), we can rearrange this equation:
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Add 25 to both sides: \[ 12m = 335 + 25 \] \[ 12m = 360 \]
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Divide by 12: \[ m = \frac{360}{12} \] \[ m = 30 \]
So the regular cost per month \( m \) is $30.
Among the options provided, the correct equation Spencer can use to find \( m \) is:
12m - 25 = 335.