How do you do answer these math question i got confused

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

The amount of money, in dollars, in an account after t years is given by a = 1000(1.03)^t. the initial deposit into the account was $_^a0 and the interest rate was _a1% per year. only enter numbers in the boxes. do not include any commas or decimal points^t. the initial deposit into the account was $__^a0 and the interest rate is % per year.

What is the average rate of change for this function for the interval from x=2 to x=4 ?