Need step by step to make sure i have the right answer.
w. section 2.2
tenisha gist cuts brass plates for an engraving job. from a sheet of brass, three pieces 4
inches wide and two pieces 7 - inches wide are cut. what is the smallest sheet of brass
required to cut all five plates?

This is so hard and it’s for a test

Peter applied to an accounting firm and a consulting firm. he knows that 30% of similarly qualified applicants receive job offers from the accounting firm, while only 20% of similarly qualified applicants receive job offers from the consulting firm. assume that receiving an offer from one firm is independent of receiving an offer from the other. what is the probability that both firms offer peter a job?

3x + 4y = 5 x- 3y = -7 solve by substitution