What is the greatest possible integer value of x for whichsquare root of x-5 is an imaginary number?

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

Use the graph of the sine function y=2sinθ shown below

Choose the more precise measurement. 26.4 cm or 8.39 cm