Please find the value of x :) my teacher wasnt much help and I missed the lesson :/ so please help​

Explain how you can show five less than a number using an algebraic expression

Jocelyn estimates that a piece of wood measures 5.5 cm. if it actually measures 5.62 cm, what is the percent error of jocelyn’s estimate? a. 2.13% b. 2.18% c. 12% d. 46.83%

Simplify: -2x 3 (-4) x 6 x (-5) x (-3) x 9