How do you simplify a radical. for example radical 68

Which of these tools or constructions is used to inscribe a hexagon inside a circle?

Taylor wants to paint his rectangular deck that is 41 feet long and 24 feet wide. a gallon of paint covers about 350 square feet. how many gallons of paint will taylor need to cover the entire deck? round your answers to two decimal places when necessary.

Can someone me and explain..will award brainlest!