Higher Plus

A bag holds 8 red and n blue counters. The probability of taking a red is 1/2. Work out n.

A histogram has four 10-wide classes from 0, with frequency densities 2, 0.5, 1, 3. Which class contains the median?

A block has mass 680 g (to the nearest 10 g) and volume 24 cm³ (to the nearest cm³). Work out the upper bound of its density, to 2 decimal places.A block has mass 680 g (to the nearest 10 g) and volume 24 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.

In an algebraic proof, how would you write three consecutive even numbers in terms of an integer n?

y is directly proportional to x. When x = 49, y = 14. Work out y when x = 64.y is directly proportional to sqrt(x). When x = 49, y = 14. Work out y when x = 64.