What number raised to both the first and second power equals 1

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

Asap! i'm not good math and i'm lost.

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?