Daily Practice - Higher Plus

A bag holds 2 red and n blue counters. The probability of taking a red is 1/3. Work out n.

On a histogram the bar for 30 < x ≤ 50 has a frequency density of 1.5. How many values are in that class?On a histogram the bar for 30 < x <= 50 has a frequency density of 1.5. How many values are in that class?

Rationalise the denominator of 35/√7, giving your answer in its simplest form.Rationalise the denominator of 35/sqrt(7), giving your answer in its simplest form.

Solve x² + 4x < 0.Solve x^2 + 4x < 0.

y is directly proportional to x³. When x = 4, y = 384. Work out y when x = 3.y is directly proportional to x^3. When x = 4, y = 384. Work out y when x = 3.