Formula for volue of cylinder is area time height. Lets find area
A=
![\pi r^2](https://tex.z-dn.net/?f=%20%5Cpi%20r%5E2)
diameter=2r
8=2r
r=4
Now substitute r to
![A= \pi r^2](https://tex.z-dn.net/?f=A%3D%20%5Cpi%20r%5E2)
A=
![\pi 4^2= 16\pi](https://tex.z-dn.net/?f=%20%5Cpi%204%5E2%3D%2016%5Cpi%20)
Now we have formula
V=
![16 \pi *height=16 \pi *9=144 \pi](https://tex.z-dn.net/?f=16%20%5Cpi%20%2Aheight%3D16%20%5Cpi%20%2A9%3D144%20%5Cpi%20)
- its the result, so B
Answer:
3x times 5=5 times 3x
Step-by-step explanation:
9b - 12b² factorised would be 3b(3 - 4b).
You can find this as you must first find a common factor between 9b and -12b², which would be 3b. We can then take this out of the bracket and divide both terms by 3b to get the final answer, which leaves us with 3b(3 - 4b).
I hope this helps!