Higher Plus

A bag holds 4 red and n blue counters. The probability of taking a red is 2/3. Work out n.

A histogram has four 20-wide classes from 0, with frequency densities 1, 3, 0.5, 2. Which class contains the median?

A block has mass 220 g (to the nearest 10 g) and volume 25 cm³ (to the nearest cm³). Work out the upper bound of its density, to 2 decimal places.A block has mass 220 g (to the nearest 10 g) and volume 25 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.

The point (-3, 5) lies on y = f(x). Write down its image on y = -f(x).

y is inversely proportional to x². When x = 2, y = 100. Work out y when x = 5.y is inversely proportional to x^2. When x = 2, y = 100. Work out y when x = 5.