Could somebody please explain the problem how this is solved? https://www. wolframalpha. com/input/?i2d=true&i=%5C%2840% 29Divide%5BPower%5B2%2C-5%5D%2C3%5D %5C%2841%29%5C%2840%29Divide%5BPowe r%5B2%2C4%5D%2C3%5D%5C%2841%29 Please be as detailed as possible. Thank you!

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.

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?