Is it possible to average 89%, 80% and 0%?

Yes it is.

Step-by-step explanation:

So what you do is you take them and add them together and divide by how many there are.

89% + 80% + 0% = 169%

169%/3 = 56.3%

56.3% is your answer.

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is