In one year, a school uses 13,480 pieces of white paper, 7,780 fewer pieces of blue paper than white paper, and 2,500 fewer pieces of yellow paper than blue paper. How many pieces of

paper does the school use in all? )

22,380 pieces of paper

Explanation:

Subtract 7780 from 13480 to find the ammount of blue paper. 13480-7780=5700. subtract 2500 from 5700 to find the amount of yellow paper. 5700-2500=3200. add 13480,5700, and 3200 to get the answer.

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.