Find the equation of a line which has a slope of 3 and crosses the y axis at -4

For how answer my question this will be the last question can you answer in math subject

Atemperature of 1.64◦f corresponds to answer in units of ◦c.

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.