3.

the volume equation for cylinder

5. diameter =half of radius
Answer:
13
Step-by-step explanation:
2(x-1)+8=4x-20
distribute 2
2x-2+8=4x-20
2x+6=4x-20
subtract 2x from both sides
6=2x-20
add 20 to both sides
26=2x
divide both sides by 2
x=13
Please rate brainliest if this helped you.
You literally need to apply the formula

where
is the mass and
is the speed
Just reverse the coordinates so it would be (3,-4) hope this helped!