Pls help me i am stuck :D

Which graph corresponds to the function f(x) = x2 + 4x – 1?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

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.