I think the answer is B hope this helps.
Step-by-step explanation:
x+9-10=500
x-1=500
x=500+1=501
You can apply the Pythagorean theorem:
a^2 + b^2 = c^2
c is the longest side of the triangle
2.2^2 + 4.2^2 = 6.7^2
4.84 + 17.64 = 44.89
22.48 =/= 44.89
That is not a right triangle
