5/12+1/4 i have a exact path thing i need help on this question

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

The function models the number of accidents

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.