Can someone me with five simple math question

Which expression will have the same sum as 3_8 + 1/4?

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 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.