I need help please thanks

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.

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each,and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent.how much did jame pay at the end?