Elizabeth can complete 4 math problems in 6 minutes. how many problems can she complete in 21 minutes at the same speed?

Is it greater than or less than7*3_9*2

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.

Y=21.95x+10 y=22.45x solve by substitution