Answer:
n²-7n-21
Explanation:
Given the expression:

First, open the brackets:

Next, bring the like terms together and simplify:

That would be 25 units. You can draw it out and you would get 25 units, or you could see the difference in -10 and 15, their distance would be 25 units.
That made no sense.
Answer: 7.25 inches
I think, I hoped this helped
Okay, so I'm assuming you want to know the intersection?
-5 = -1/2x - 2
-3 = -1/2x
1/2x = 3
x = 6
(6, -5)