-9x + b
-9(-5) + 4
45 + 4
49
X = 180 - 60 - 80
x = 40
hope it helps
Use pythagorean theorem to find the bottom side of the left triangle.
12^2+b^2=15^2
144+b^2= 225
b^2= 81
b=9
you will then subtract 9 from 25 to get 16
area from the triangle on the right
A=(1/2)16*12
A= 96 in^2
then for the triangle on the right
A= (1/2)12*9
A= 54 in^2
then add the two areas together
Total Area= 150 in^2
Holy @$#% THAT LOOKS HARD! Sorry, I can't help I don't know that math yet.
Solve for x
x-4=11
x=11+4
x=15