I am having difficulty with this question. Would someone be able to detail the steps involved in doing this question. If someone could also provide an intuitive tutorial source related to this question that would be great (book i'm using isn't so useful).

Find the volume of the solid obtained by revolving y = 4 - x^2 about the

x-axis from x = 0 to x = 2.

Edit: Does anyone know of an online calculator for these types of problems?