4 . A spotlight uses coloured gels to create the different colours of light required for a theatrical production. Each gel reduces the original intensity of the light by 10%. A. Write an equation that models the intensity of light, I, as a function of 'x', the number of gels used. A /2 B. Use your equation to determine the percent of light left if 9 gels are used. Round to the nearest A /1 hundredth of a percent. C. Explain why this is an example of exponential decay. /1 n D /1