Daily Practice - Higher

21 students study Spanish and 3 of those also study Art. One Spanish student is picked at random. Work out the probability they study Art.

A box plot has minimum 8, lower quartile 16, median 22, upper quartile 27 and maximum 30. Work out the interquartile range.

Write 75 in the form a b, where b is as small as possible.Write sqrt(75) in the form a sqrt(b), where b is as small as possible.

For the curve y = x² + 8x - 7, work out y when x = 1.For the curve y = x^2 + 8x - 7, work out y when x = 1.

y is directly proportional to x². When x = 6, y = 108. Work out y when x = 9.y is directly proportional to x^2. When x = 6, y = 108. Work out y when x = 9.