Jasmine Try Vour THE HARDEST MATH PROBLEM GRADE 8 At Sunny Middle School, Ms. Addison's class is investigating how greenhouse gases (GHGs) contribute to global climate change. They Sources of CO. Emissions wrote their research on note cards for a Typical Household planet . Greenhouse gases cause climate change by trapping heat on the . Greenhouse gases contribute to smog and air pollution, which Hating and can cause respiratory diseases, like asthma. Cooking . Extreme weather, disruptions to the food supply, and increased wildfires are also caused by greenhouse gases "Where do greenhouse gases come from?" Mia asked. "One of the most common greenhouse gases is carbon dioxide, also known as COz. People release COz into the atmosphere when we burn fossil fuels (like coal and natural gas) for energy and transportation" Ms. Addison answered The class examined the graph to the right. The source for the largest percentage of CO: emissions for a typical household was vehicles The students conducted some research and found: Vehicles > Highway vehicles release about 17 billion tons of GHGs each year- Appliances > Each gallon of gasoline burned creates 20 pounds of GHG > A typical vehicle releases 6 to 9 tons of GHG into the atmosphere each year. Solve the Problem While researching. Ichiro found that a gasoline car can drive 210,000 miles on average over Annual Emissions per Vehicle its lifetime (period of time a car can operatel. 15.000 A plug-in hybrid car can drive a lifetime of 300,000 miles. 11 415 Consider two families that each drive 15,000 miles a year for the lifetime of the car-one 10.000 with a gasoline car and the other with a plug-in hybrid. Pounds of CO. Equivalent 5,680 6.258 What is the percent decrease for the pounds 5 0000 of CO: that the plug-in hybrid car would emit 3,774 over its lifetime as opposed to the gasoline car? Round your final percentage to the nearest integer All Plug-In Hybrid Gasoline Electric Hybrid