If a 72-candela light source is located at a distance of 3 meters from a surface, the illuminance on the surface is

Answer(b) 60 miles per hour;

If one were to put the y value into the equation, they could find out what x is for a certain value of y.  putting in the value of y (1), we get the equation: 1=4x-12=4xx=0.5this means that the value of x when why is 1 is x=0.5