Draw a line graph for the given set of tables below

Write the equation below the represents the line passing through the point (-3, -1) negative one with a slope of 4

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

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?