Daily Practice - Higher

Write √18 in the form a √b, where b is as small as possible.Write sqrt(18) in the form a sqrt(b), where b is as small as possible.

Factorise 20x² + x - 12.Factorise 20x^2 + x - 12.

y is directly proportional to x². When x = 4, y = 128. Work out y when x = 3.y is directly proportional to x^2. When x = 4, y = 128. Work out y when x = 3.

A sphere has radius 3 cm. Work out its volume, leaving your answer in terms of π.A sphere has radius 3 cm. Work out its volume, leaving your answer in terms of pi.

4 of 6 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.