I used the formula a^2+b^2=c^2 but i don’t know if I was supposed to use the distance formula? Help : /

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?

Quadrilateral efgh was dilated with the origin as the center of dilation to create quadrilateral e'f'g'h'. the quadrilateral was dilated using a scale factor of 2.5. the lengths of the sides of quadrilateral efgh are given. what is the length of side f'g'?