The intensity I of light from a light bulb varies inversely as the square of the distance d from the light bulb. Suppose I is 250 W/m2 when the distance is 3 m. How much farther would it be to a point where the intensity is 160 W/m²? It would be meters farther. (Simplify your answer.)

Suppose P varies jointly with r and the square of m.  When r=2 and m=3, then P=36. Find P if r=10 and m=2.

4. The height h of a geometric solid varies directly as the volume V and inversely as the square of the radius r. Find the equation of variation if h = 22.6 cm when r = 54.3 cm and V = 209,300 cm³. Extension: What is the solid?

y varies directly as the square root of x. If x= 16 then y = 20. Find a when y = 40. I = M