so basically u just put in the numbers from the formula at the top so the radius or in this case the diamter and at the too half of the diameter of 10 is 5 since 10/2=5. Then the height is 7 so I put that and multiplied 25 times 7 since 5 by the second power is 25 then I multiply by pie since it's in the formula and I got 54 cm3 since u only need to put two decimal places.
I hoped this helped!