A swim pass costs $30 for the first month. Each month after that, the cost is $20 per month. Riley wants to swim for 12 months.

The sequence for this situation is arithmetic. The 12th term will be the amount Riley spends for a one year swim pass.

Which equation represents the total cost of a one year swim pass?

Question

A swim pass costs $30 for the first month. Each month after that, the cost is $20 per month. Riley wants to swim for 12 months.

The sequence for this situation is arithmetic. The 12th term will be the amount Riley spends for a one year swim pass. 

Which equation represents the total cost of a one year swim pass?

anonymous · Answer

30+20x 

where x is the number of months.

anonymous · Answer

30 + 20

Equation for the total cost of a one-year swim pass,
$$a _{12} = 30 + (11)(20)$$