Write an expression for a and b

pietro used an eight-foot board to cut 3 shelves. each shelf was 2 1/2 feet long.

a. how much board did the 3 shelves use
b. how much, if any, wood did pietro have left?

How many square centimeters of wrapping paper will be used to wrap the shoe box?

My final challenge question of the day! i have no tests, nothing to do this for, it is simply giving away free points for a you tube video! so 50 free points for answering the most simple question ever! here is the key to getting brainiest for this question. answer in under 50 seconds. you think you can do it. i think you can. here is the question: 1x2= i know! easiest question ever! and yes! if you answer this question, you will be on you so come on and get the free 50 while you can!

Aband wants to create a cd of their last concert. to creat the cds, the cost will be $350 advertisement fee plus $3 per cd.write an inequality that represents how many cds they can buy with a maximum of $1225.solve the inequality