100 points! answer #21. show your work .

What is the volume of this square pyramid?

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?

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.