<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:

Answer:
DWWDDWDWDAWDWDAWD
Step-by-step explanation:
WDWDAWDDAWD AWDDAWD
X= 7.5 because you subtract 2.5 from 10 and you get 7.5 which equals X
1st is 19
2nd is 23
3rd is 27
4th is 31
5th is 35
6th is 39
7th is 43
8th is 47
9th is 51
10th is 55
This is because you are adding 4 each time, the rule of the sequence is 4n+15