We collect like terms
8x - 3x = 3 + 5 + 9
This is bcos if a (-) sign crosses the equals sign it becomes a (+), and if a (+) sign crosses the equals sign it becomes (-)
We the have
5x = 17
Divide both sides by 5
x = 17/5
x = 3.4
The answer is 452.39 because 24/2 =12 and the area is 12^2*3.14
c = 
using Pythagoras' identity on the right triangle
c = √( 4² + (
)² ) = √16 +
=
= 
Here is the answer below:
3 is always repeating that's what I think