Mr. morris' art class used blue paint and purple paint for a school mural. find the part-to-whole ratio of purple paint to the total

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

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.