The illuminance of a light, E, varies directly with the intensity of the light, I, and inversely with the square of the distance, D from the light. At a distance of 8 feet, a light meter reads 7 units
for a 48-cd lamp. Find the illuminance of a 32-cd lamp at a distance of 3 feet.

expression #3 is not equivalent. the others are.

the ratio of white tiles to blue tiles is 48: 16. the ratio in it's simplest form is 3: 1.

step-by-step explanation:

ratio: take the first number and add a colon next to it, then add the second number after that. make sure the ratio order matches up with the written problem!

simplest form: we can simplify the ratio 48 : 16 by dividing both terms by the greatest common factor (gcf).

the gcf of 48 and 16 is 16.

divide both terms by 16:

48 ÷ 16 = 3

16 ÷ 16 = 1

reducing to simplest form:

48 : 16 = 3 : 1

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step-by-step explanation: