I’m stuck and I don’t know what to do someone help please

For the second question, you’re finding the volume of a cylinder. The formula is V = (pi)(r^2)(h) so we will plug in what we know. Half of a diameter is the radius so 6/2 = 3. It says radius squared so 3^ 2 = 9. We can also see the height is 9 cm so plug that in. For all of these formulas, we must use 3.14 for pi so plug that in also.
V = (3.14)(9)(9)
V = 254. 34 cm cubed

I don’t have time to help with the other questions but I hope this helps you know how to use the cylinder volume formula

Hope i can you!

I’m not absolutely sure but i think it’s 7x6x5x4x3x2=5040 because as the first character you can take any of the 7 given then you are left with 5 then 6 then 4 etc.