Which is the inverse of the function y=1/2x^2

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

Which expression is equivalent to 3^3 + 2^2?

20 points + brainliest answer + my mom’s chocolate chip cookie ! subtract.