She would have been covering 20km for ten minutes multiply that by 6 so she was going 120km/hr so she is 60 km over the speed limit
Answer:
Step-by-step explanation:
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Answer:
6.28 gallons
Step-by-step explanation:
first we need to find the area of a half sphere, and then find how much paint will be needed for that area.
The area of a sphere:
![a=4 \pi r^2](https://tex.z-dn.net/?f=a%3D4%20%5Cpi%20r%5E2)
thus, the area of half a sphere is:
![a=2 \pi r^2](https://tex.z-dn.net/?f=a%3D2%20%5Cpi%20r%5E2)
we know that the radius is:
![r=20ft](https://tex.z-dn.net/?f=r%3D20ft)
we substitute this to find the area of the half sphere (the area they need to paint):
![a=2\pi (20ft)^2\\a=2(3.1416) (400ft^2)\\a=2,513.27ft^2](https://tex.z-dn.net/?f=a%3D2%5Cpi%20%2820ft%29%5E2%5C%5Ca%3D2%283.1416%29%20%28400ft%5E2%29%5C%5Ca%3D2%2C513.27ft%5E2)
now the question is how many gallons of paint are needed to paint 2,513.27 square feet.
We are told that 1 gallon covers 400 square feet
thus, we must divide 2,513.27 by 400:
![\frac{2,513.27ft^2}{400ft^2} =6.28](https://tex.z-dn.net/?f=%5Cfrac%7B2%2C513.27ft%5E2%7D%7B400ft%5E2%7D%20%3D6.28)
6.28 gallons of paint are needed.