The diameter of a sphere is 14 cm. Calculate its volume.

In the given figure, PT is a tangent to the circle with centre O. If OT = 6 cm and OP = 10 cm, then length of tangent PT is ______ .

A man goes 80 m due east and 150 m due north. How far is he from the starting point?

Which of the following cannot be the probability of an event?

If -2 and 3 are the zeros of the quadratic polynomial x² + (a + 1) x + b then a = ___ and b = ______.