Higher Plus

A block has mass 260 g (to the nearest 10 g) and volume 23 cm³ (to the nearest cm³). Work out the upper bound of its density, to 2 decimal places.A block has mass 260 g (to the nearest 10 g) and volume 23 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.

The curve y = sin x° is drawn for 0 ≤ x ≤ 360. Write down the value of y when x = 0.The curve y = sin x° is drawn for 0 <= x <= 360. Write down the value of y when x = 0.

y is inversely proportional to x². When x = 4, y = 50. Work out y when x = 5.y is inversely proportional to x^2. When x = 4, y = 50. Work out y when x = 5.

A triangle has sides 9 cm, 7 cm and 12 cm. Work out the angle opposite the 9 cm side, to 1 decimal place.

A bag holds 8 red and n blue counters. The probability of taking a red is 8/13. Work out n.