During each hour, an exhaust fan removes 15.0% of carbon dioxide present in the air in a room at the beginning of the hour. What percent of carbon dioxide remains after 10.0 hours?

Q: According to a certain central bank from 2000 to 2016 the average price of a new home in a certain…

A: It is given that, the average price of a new home in a certain region increased by 79% to $483…

Q: Convert the rate 350 kilocalories per hour to calories per minute. 17,500 calories per 3 minutes 35…

A: We know that the one kilocalories is equal to 1000 calories and 1 hour is equal to 60 minutes. So,…

Q: Each large rectangle below represents one whole. What percent is represented by the shaded area?

A: The given figure consist of two large rectangle. Each rectangle is divided in to 5 equal parts.

Q: What is the magnitude in the Richter scale of an earthquake that released 10 joules of energy? (5

A: Direct use the formula of Richter Scale and substitute the given values then simplify.

Q: During each hour, an exhaust fan removes 15.0% of the carbon dioxide present in the air in a room at…

A: Solution :  Given that  Decreasing rate  r = 15.0% = 15/100 = 0.15  Number of hours  n = 10.0 hours

Q: Your electrical bill states that you used 840 kilowatt-hours of energy in January. Determine your…

A: The number of kilowatt- hours of energy in January is 840.

Q: According to the American Wind Energy Association, wind energy operating capacity increased from…

A: You have asked multiple unrelated questions in the same post. I have addressed the first one. Please…

Q: over a recent 4-day period, the number of commercial flights decreased by 7.36%. Assuming this trend…

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Q: In the 2000 U.S. Census, a small city had a population of 50,000. By the 2010, the population had…

A:

Q: In 2015, there were approximately 3,998,000 million births in the United States. Find the birth rate…

A: Given,The number of births in U.S (in 2015) = 3998000Total population of U.S = 321 millions

Q: a particular car is said to depreciate 15 percent each year. if the car new value is at 20,000, what…

A:

Q: There are 1,750,235 acres of forest.  One half percent of the forest is destroyed by pollution every…

A: Given :                   Decay :          y= a(1-r)x         a - initial amount before measuring…

Q: From its founding through 2015, the Rock and Roll Hall of Fame has inducted 303 groups or…

A:

Q: A particular car model depreciates 11.8 percent anı Find the value of a $25400 car 5 years after its…

A:

Q: A bike shop reduces the price of a bike for quick sale from $455.00 to $395.00. Compute  the…

A: Given: A bike shop reduces the price of a bike for quick sale from $455.00 to $395.00.

Q: A gram is what percent of a kilogram?

A: 1000 grams = 1 kilogram

Q: A vacuum pump removes one-half of the air in a container with each stroke. After 10 strokes, what…

A: Given that, the vacuum removes one-half of the air in a container with each stroke. Assume that the…

Q: Each side of a square is increasing at a rate of 2 cm/s. At what rate is the area of the square…

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Q: A 25-year-old woman burns 600t cal/hr while walking on her treadmill. How many calories are burned…

A: Given  Amount of calories burn per hour = 600t

Q: If the base of a triangle is increased by 60%, find the percentage change in the height of the…

A:

Q: what percentof the air will remain in the container,6 seconds after opening the bottle?

A:

Q: A sample of radioactive material disintegrates from 6 to 5 grams in 150 days. After how many days…

A:

Q: The recorded total number of accidents in a 1.5km section of highway from 2016-2020 is 557. If the…

A: Use the formula for accident rate and Substitute the given datas than simplify.

Q: The schools principal estimates that the current enrollment of 750 students will increase 5% each…

A:

Q: If the population increases by 2.5% per year, what percentage does it change in 5 years?

A: Per year increment rate(r)=2.5%  In n years % change=1+r100n-1

Q: If one third of the water in a container is removed by each stroke of a water pump, by how many…

A: The amount of water removed by one stoke is 13 of amount.

Q: Convert the rate 350 kilocalories per hour to calories per minute. O 17,500 calories per 3 minutes O…

A:

Q: In one day, the blower fan of a forced air heating system runs for 9 hours.What percent of the day…

A: Given that in one day that is in 24 hours, the blower fan of a forced air heating system runs for 9…

Q: The population of a certain colony of bacteria increases by 5% each hour. After 6 hours, what is the…

A:

Q: Sixty ounces of a 30% gold alloy are mixed with 40 oz of a 10% gold alloy. Find the percent…

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Q: In the 2000 U.S. Census, a small city had a population of 60,000. By the 2010, the population had…

A:

Q: Each big square below represents one whole. What percent is represented by the shaded area?

A: We have to find the percentage of the shaded area.

Q: The number of fish in a pond triples every 9 years. By what percent does the population change each…

A:

Q: If an object lose 45% of its value over 5 years, what percent of it's value does it lose over one…

A: Let it loosed x of its value over one year So, after 5 years it will be (1-x)5 of the initial value.…

Q: The average person breathes 6 times per minute (at rest), inhaling and exhaling half a liter of air…

A: Given:The average person breathes 6 times per minute (at rest), inhaling and exhaling half a liter…

Q: Approximately 430 000 birds were killed by wind turbines in a given country. It is estimated that…

A: Given information:It is given that; the approximate number of birds killed by wind turbines in a…

Q: in 2015, there were approximately 3,901,000 births in a country. Find the birth rate in births per…

A:

Q: The population of the Norway doubled in the last 12 years from 1995 to 2007. Assuming the rate of…

A: According to question,Population of Norway doubled in 12 years from 1995 to 2007.

Q: In the 2000 U.S. Census, a small city had a population of 40,000. By the 2010, the population had…

A: Let the population of city at time t be:  y(t)

Q: A gift card loses 10% of its value every year. At the end of 10 years, what percent of the gift…

A: Given, a gift card loses 10% of its value every year. At the end of 10 years,

Q: To avoid a mountain range, a helicopter must climb 7,485 feet in 4 minutes. What is the helicopter's…

A: It is given that the helicopter must climb 7,485 feet in 4 minutes.

Q: In a certain​ city, it was recorded that 16 2/7 inches of rain fell over a​ 24-hour period. How…

A: Given, 1627  inches of rain fell over 24 hours.

Q: A new IPhone is estimated to lose 25% of its value every semi-anually after its purchase. How much…

A:

Q: The population of Town C triples every 10 years. What is the annual percent change in the population…

A: Let the annual percentage change = x % Initial population = P Population after 10 years = 3P time =…

Q: What percent of the phones have a battery life less than 5 or greater than 5.5 hours?

A: As per instruction we have to solve part c.

Q: A small hole in a rubberized container allows of the air to 20 escape each second. What percent of…

A: We have to find the percent of the air will remain in the container, 6 seconds after opening the…

Q: A small hole in a rubberized container allows 20 of the air escape each second. What percent of the…

A:

Q: for $1300/month each, what is the total annual amo

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Q: In a recent year, wind machines in a country generated 185.8 billion kWh of electricity, enough to…

A:

Q: The value of a currency appreciated by 7.80% of its value last month and then depreciated by 7.80%…

A: The term per cent means for every hundred. A fraction whose denominator is 100 is called a…