Answer:
D
Step-by-step explanation:
<h2>
Answer:</h2>
The equation that is used to model the length of ladder in terms of x is:

<h2>
Step-by-step explanation:</h2>
We can model this problem with the help of a right angled triangle whose hypotenuse is 13 meters and the other two legs are x meters and (x-7) meters.
where x is the distance between the top of the ladder and the ground.
and (x-7) is the distance between the foot of the ladder and the wall.
Hence, using Pythagorean Theorem we have:

Hence, the answer is:

x=1/2
i hate the minimum word count
no one comes on here to learn how to do it, we come on here to get answers
x/2 + 4 < 7
multiply both sides by 2
x/2 * 2 + 4 * 2 < 7 * 2
which equals
x + 8 < 14
subtract 8 from both sides
x + 8 - 8 < 14 - 8
x < 6