I agree it is one and I used this calculator called MathPapa that can help with algebra you should try it. It is free.
Answer:
it's 8-3m
Step-by-step explanation:
You would use the Pythagorean there on which is a^2+b^2=c^2, from there you plug int what they gave you and solve for b, and b=12
I believe the answer is 104.