X is 180 - 30 = 150,
The sum of the sides of a polygon is the (number of sides - 2) * (180) so the total interior angle measure of the right polygon is 360.
360 = 80 + 90 + 150 + y
x = 150
y = 40
Yes because negative times a negative equals a positive
Given those zeros you have
X=0, x=1, and x=7
Since your factors are set equal to zero you just rewrite what’s above to equal 0.
X is just x
X=1 is (x-1)
X=7 is (x-7)
So your function is
x(x-1)(x-7)