Answer:
it woukd be B becahse if the tennis ravket hits it like that...it will go up ibto the air because of the impact and friction
Haha, I used to do IXL all the time. Continuing onto the question, it's asking it in mixed number form..
17/9, how many 9's go into 17? I'd say 1 time, or if we 2 we'd go over.
so 1 times 9 = 9
What's the remainder? 17-9=8
so you've got only one whole 9, and 8 left over
so {{ 1 8/9 }} is the answer
Finding the new mean is simple: If ![E[X]=10](https://tex.z-dn.net/?f=E%5BX%5D%3D10)
, then ![E[2X]=2E[X]=20](https://tex.z-dn.net/?f=E%5B2X%5D%3D2E%5BX%5D%3D20)
.
Meanwhile, the standard deviation is the square root of the variance, which is given by
![V[X]=E[X^2]-E[X]^2\implies V[2X]=E[(2X)^2]-E[2X]^2=4E[X^2]-(2E[X])^2](https://tex.z-dn.net/?f=V%5BX%5D%3DE%5BX%5E2%5D-E%5BX%5D%5E2%5Cimplies%20V%5B2X%5D%3DE%5B%282X%29%5E2%5D-E%5B2X%5D%5E2%3D4E%5BX%5E2%5D-%282E%5BX%5D%29%5E2)
![\implies V[2X]=4\underbrace{\left(E[X^2]-E[X]^2\right)}_{V[X]}=12](https://tex.z-dn.net/?f=%5Cimplies%20V%5B2X%5D%3D4%5Cunderbrace%7B%5Cleft%28E%5BX%5E2%5D-E%5BX%5D%5E2%5Cright%29%7D_%7BV%5BX%5D%7D%3D12)
and so the new standard deviation would be ![\sqrt{V[2X]}=\sqrt{12}=2\sqrt3](https://tex.z-dn.net/?f=%5Csqrt%7BV%5B2X%5D%7D%3D%5Csqrt%7B12%7D%3D2%5Csqrt3)
.
If the soil is replaced after a strip mining it will help in restoring the environment, but it is not a quick or easy process. For the environment to be restored in a similar way that it was before the strip mining, it will take decades, and that will only happen if the institutions, the green organizations and the locals, collaborate with each other, and make a very detailed plan are put it in practice. Also the place will need to be planted with the same types of plants, the same types of animals will need to be brought back, and the numbers of both plants and animals will have to be carefully managed, so that the ecosystem is similar to what it was.
Answer:
D
Explanation:
If you have a specific goal in mind you'll be more motivated and know exactly what you're working towards instead of blindly doing something without having a vision for what you want it to look like in the end, and it will make you want to do it more because you know exactly what you need to do to get to that end goal.
