What is the taxidistance between (8,17) and (21,32)

Hi my sisters and brothers can tell me the answer because i don’t understand the question

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?