PLZ HELP I WILL GIVE BRAINLIEST..

1.) The temperature fell by 9 degrees Fahrenheit today.
Write a signed number to represent this temperature change.

2.) A growing animal gained 9 pounds.
Write a signed number to represent this weight change.

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?