If someone could explain to me how to get the right answer on these i would really appreciate it

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

How many grams the dog will eat in 3 days?

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?