I need help thank you

What's the difference between: x≥0 and nonnegative integer. ?

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

Prism m and pyramid n have the same base area and the same height. cylinder p and prism q have the same height and the same base perimeter. cone z has the same base area as cylinder y, but its height is three times the height of cylinder y. the figures and have the same volume.