Slope = 4/5 because the formula for slope is rise/run. count the x and y units point one and point two are away from each other.
Slope does not exist. A zero in the numerator means you have a horizontal line.
Answer:
x=1
Step-by-step explanation:
This stuff is quite easy in reality. Here's a little example including your numbers.

by this point we are left with simplifying it. Since it's a double negative we get a positive. Thus x=1
Just multiply them together and get a4-2a2-24.
(a2-6)(a2+4)
F: a4
O:4a2
I:-6a2
L:-24
Add together
a4-2a2-24