You are baking and run out of an important ingredient. Rather than fire up the car, you decide to use a bicycle. The store is 1/2 mile away. Assume your car gets 30 miles to the gallon. If every driver on the planet made a similar decision once per week for a year, approximately how much gas would be saved for that year

approximately 1.213 billion gallons of fuel will be saved per year.

Step-by-step explanation:

Distance to the store = 1/2 mile

If my car gets 30 miles to one gallons, then for 1/2 mile my car will use

1/2 ÷ 30 = 1/2 x 1/30 = 1/60 gallons

Statistics puts the number of cars users on Earth to be about 1.4 billion = 1.4 x 10^9 cars

If every driver makes this decision once a week for a year, that will be 52 times a year since there are 52 week in a year.

Total gas that will be saved in one week = 1/60 x 1.4 x 10^9 = 23333333.3 gallons

In a year that will be = 23333333.3 gallons x 52 = 1.213 x 10^9 gallons

that is approximately 1.213 billion gallons of fuel saved per year

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step-by-step explanation:

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expression #3 is not equivalent. the others are.