Domain is the set of numbers you can use
usually, domain=all real numbers except those that divide by zero
so find those exceptions
find what numbers make deonenator equal to 0 and exclude them
x-23 is denom
x-23=0
x=23
doman is all real numbers except 23
5b^3 sq rt of a
There's not enough a's
B is the answer because it does not give information for the third side. We cannot assume it is equal because it is not a right triangle.
