Mario invested $6,000 in an account that pays 5% annual interest compounded annually. using the formula a = p(1 + r)t, what is the approximate value of the account after 2.5 years?

You know the formula so fill it in like this: A(t)= 6000(1+.05)^(2.5). First add what's inside the parenthesis to get A(t)= 6000(1.05)^2.5. Now take 1.05 to the power of 2.5 to get A(t)=6000(1.1297).  Finish by multiplying: A(t)= $6778.36

The answer would be 6778 because P being the investment, r the rate and t all t is time. 6000(1+05) ^ 2.5. I hope this helps you!