8. The landing distance that a certain plane will travel on a runway is determined by the initial landing speed at the instant the plane touches down. The following function

relates landing distance, D(x), to initial landing speed, x, where x2 15. D(x)=\frac{1}{10} x^{2}-3 x+22 where D is in feet and x is in feet per second. a. Find D(90) and interpret the meaning of the function value in terms of landing speed and length of the runway. b. Find D(110) and interpret the meaning in terms of landing speed and length of the runway.