Answer:
D, A, C,
Step-by-step explanation:
7x+15=38
7x=38-15
7x=23
x=23/7
Step-by-step explanation:
ejdjbd x bxbx k wbu y DJ UK j HK JM dz
nb
In a rectangular triangle
.
We have 
Therefore opposite = 3uints and adjacent = 4units.

We need the length of hypotenuse.
Use the Pythagorean theorem:

Substitute:

(w - 7)(w + 4)
w^2 - 7w + 4w - 28
w^2 - 3w - 28