What two numbers multiply to -24 but also add to 22?

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

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?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.