Step-by-step explanation:
(1) The radius of sphere is 4.5 units.
The volume of volume of sphere is given by :
![V=\dfrac{4}{3}\pi r^3](https://tex.z-dn.net/?f=V%3D%5Cdfrac%7B4%7D%7B3%7D%5Cpi%20r%5E3)
![\pi=3.14\ , r=4.5](https://tex.z-dn.net/?f=%5Cpi%3D3.14%5C%20%2C%20r%3D4.5)
So,
![V=\dfrac{4}{3}\times 3.14\times (4.5)^3](https://tex.z-dn.net/?f=V%3D%5Cdfrac%7B4%7D%7B3%7D%5Ctimes%203.14%5Ctimes%20%284.5%29%5E3)
Option C is correct.
(2) If we solve the plugged values, then we get :
![V=\dfrac{4}{3}\times 3.14\times (4.5)^3](https://tex.z-dn.net/?f=V%3D%5Cdfrac%7B4%7D%7B3%7D%5Ctimes%203.14%5Ctimes%20%284.5%29%5E3)
![V=381.5\ \text{units}^3](https://tex.z-dn.net/?f=V%3D381.5%5C%20%5Ctext%7Bunits%7D%5E3)
Option C is correct.
Answer:
18x+24
Step-by-step explanation:
For this, you have to multiply 6 to the numbers inside the parenthesis.
SO, 6 x 3x and 6 x 4
6 x 3x=18x
6 x 4=24
The answer will be 18x+24
9514 1404 393
Answer:
D. 210
Step-by-step explanation:
If b is the number of boys in the choir, the ratio of boys to girls is ...
b/150 = 7/5
b = 150(7/5) = 30(7) = 210
There are 210 boys in the choir.
#1. 720 Nm
Work = force x distance
Work = 80N x 9m = 720 Nm
#2. 90J
Assume no energy lost in the process,
<span>Kinectic energy=(80N - 70N) x 9m
= 90J
#3. 630J
Heat energy = work - kinetic energy
Heat energy = 720J - 90J
= 630J</span>