What is the sum of the series?
∑k=15(3k)2
Enter your answer in the box.

14 months

Step-by-step explanation:

Let Theda pays for m months,

Given,

The equipment cost = $56.00,

Also, the monthly cost = $29.00,

So, the monthly cost for m months = 29m dollars,

Hence, the total cost = Equipment cost + monthly cost for m months

= ( 56 + 29m ) dollars

According to the question,

Therefore, she can pay 14 months.

Second option is correct.