Daily Practice - Higher

y is directly proportional to x². When x = 5, y = 75. Work out y when x = 9.y is directly proportional to x^2. When x = 5, y = 75. Work out y when x = 9.

A sphere has radius 9 cm. Work out its volume, leaving your answer in terms of π.A sphere has radius 9 cm. Work out its volume, leaving your answer in terms of pi.

4 of 9 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.

A box plot has minimum 11, lower quartile 21, median 26, upper quartile 34 and maximum 42. Work out the interquartile range.

Write √48 in the form a √b, where b is as small as possible.Write sqrt(48) in the form a sqrt(b), where b is as small as possible.