Barry bought a wooden board that measured 8 feet in length. He cut off a piece that measured 6 5/9 feet. How much of the board was left?

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Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

We just started the introduction into circles and i have no idea how to do this.