Answer: C
Step-by-step explanation:
it should be C
Answer:
![Total = \$5d - 2](https://tex.z-dn.net/?f=Total%20%3D%20%5C%245d%20-%202)
Step-by-step explanation:
Represent Alice with A, her friend with F and you with Y.
From the question, we have:
![A = \$d](https://tex.z-dn.net/?f=A%20%3D%20%5C%24d)
--- Twice as much Alice means 2 times Alice's earnings
--- 2 less than her friend
Required
Determine the total amount
![A = \$d](https://tex.z-dn.net/?f=A%20%3D%20%5C%24d)
Substitute
for A in
![F = 2 * \$d](https://tex.z-dn.net/?f=F%20%3D%202%20%2A%20%5C%24d)
![F = \$2d](https://tex.z-dn.net/?f=F%20%3D%20%5C%242d)
Substitute
for F in ![Y = F - 2](https://tex.z-dn.net/?f=Y%20%3D%20F%20-%202)
![Y = \$2d - 2](https://tex.z-dn.net/?f=Y%20%3D%20%5C%242d%20-%202)
The total amount is calculated by adding the earnings of Alice, her friend and you
![Total = A + F + Y](https://tex.z-dn.net/?f=Total%20%3D%20A%20%2B%20F%20%2B%20Y)
![Total = \$d + \$2d + \$2d - 2](https://tex.z-dn.net/?f=Total%20%3D%20%5C%24d%20%2B%20%5C%242d%20%2B%20%5C%242d%20-%202)
![Total = \$5d - 2](https://tex.z-dn.net/?f=Total%20%3D%20%5C%245d%20-%202)
<em>Hence, the total earnings is 5d - 2</em>
A because mean is average.
Answer:
12.56
Step-by-step explanation:
4 ×3.14 to get 12.56
It is given in the question that the formula of volume of cone is
![V = \frac{1}{3} \pi r^2 h](https://tex.z-dn.net/?f=V%20%3D%20%5Cfrac%7B1%7D%7B3%7D%20%5Cpi%20r%5E2%20h)
Where V is the volume, r is the radius and h is the height.
And we have to find an expression for h.
First we multiply both sides by 3, and on doing that we will get
![3 V= \pi r^2h](https://tex.z-dn.net/?f=3%20V%3D%20%5Cpi%20r%5E2h)
Now to isolate h, we have to get rid of pi r square by dividing.
![h= \frac{3V}{ \pi r^2}](https://tex.z-dn.net/?f=h%3D%20%5Cfrac%7B3V%7D%7B%20%5Cpi%20r%5E2%7D)
Therefore the correct option is B.