The triangle to solve for has a leg or 12 feet, hypotenuse of 20 feet, so solve for Pythagoras

for a

a = 16 feet
Hey read the image I have attached. Ignore what I am typing here I need to type 20 characters.
4:5 8:10 12:15 that some eqivelent ratios
The first one means what is the smallest number that goes into 12 which would be 4. The second one mean what does not go into 4 and 6 so that would be 8 because 6 is not a multiple of 8.The third one is either 1 or 2 not sure. And the 4th one is little complicated you might want to look up video on prime factorization that can really help you .
X=11
All you have to do is add 5 to both sides and then divide by 5 on both sides