The second of two numbers is nine more than four times the first. there some is 89 find the numbers

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.