SelectALL of the expressions that can be used to find 2% of 64?

For what values of x is x2 + 2x = 24 true?

Cal's go cart has a gas tank with the dimensions shown below. he uses a gas can that holds 11 gallon of gas, to fill the go cart tank. 11 gallon = 231 inches^3 how many full gas cans will it take to fill the go cart's gas tank?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n