Help please I don’t really understand

35

Step-by-step explanation:

We first need to find the missing side of the base triangle.  

15^2 - 9^2 = x

144 = x^2

x = 12

Then, we can use the same formula (Pythagorean theorem) to find BD.  

37^2 - 12^2 = x

1225 = x^2

x = 35

f(x) is going down by 4

step-by-step explanation:

(its either that or its going left by 4)

-2

7 - 9 = -2

reversed:

-2 + 9 = 7