Can you help me on this question?

What is the area of the triangle 10 13 12

What is the slope of the line that contains the points (-2,1) and (0,-3)

Problem 3 a bank charges a service fee of $7.50 per month for a checking account. a bank account has $85.00. if no money is deposited or withdrawn except the service charge, how many months until the account balance is negative