108 x 100/75 = 108 x 1.25 = 144
108 is 75% of 144.
Hope this helps :)
g(x) - f(x) = x^2 - 9 - (2 - x^1/2)
= x^2 + x^1/2 - 11
negative x gives no real value for this function because x^1/2 is not defined for negative x
the domain is x >= 0 or in interval notation [0, ∞)
The picture isnt clear enough