These are really easy once you know how to use the formula for compounded interest.
The effective annual rate of interest for 5.75% compounded quarterly uses this formula:
Annual Effective Rate = [(1 + r/t)^(t)] - 1
Where r = the interest rate in decimal form (.0575 in your example)
t = number of times per year interest is earned (in your example compounded quarterly means interest is earned every quarter or every 3 months. So in total, interest is earned 4 times per year so t=4, agree?)
Just plug these into the formula and you will get the effective annual rate, but it will be in decimal form. If you want to show it as a percentage, just multiply your answer by 100.
Hope this helps