OK y'all, one more, help please !!

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

Atorch and a battery cost 2.50 altogether. the torch costs 1.50 more than the battery. what fraction of the total price is the torch? give your answer in its simplest form.

The product of 3 and a number increased by 8 is 31 written as an equation