Answer:
The answer is 0
Step-by-step explanation:
Step-by-step explanation:
horizontal lines will have a gradient(m) of 0
so if m=0 , the line is horizontal
formula to find m:
m=y2-y1 / x2-x1
insert coordinates into formula

As m=0 , therefore it is a horizonta line.
hope this helps..
75. As she is going up, 15 stairs have been passed by the escalator moving. When she goes down same thing
I think the answer is 27.43