1) Emily rounds a number, m, to 3 significant figures. The result is 3.47. Write an error interval for m. 2) Prove algebraically that 0.08 (Reocuring dot on top of 8) = 4/45 (Fraction)

3) A rectangular lawn measures 3.5 m by 4.7 m to the nearest 10 cm. Turf costs £2.24 per square metre

Work out an error interval for the total cost of laying the turf. Show all your calculations

4) The mass of a piece of gold is 45.2 g. The density of the gold is 19.3 g/cm'.

Given that both values are rounded to 1 decimal place, work out the upper bound for the volume of the gold.

Give your answer to 3 significant figures.