To deliver a package, a drone flies x x\,x km due East and then y y\,y km due North.
x=4.6x = 4.6x=4.6 km correct to the nearest 100 metres
y=9.3y = 9.3y=9.3 km correct to the nearest 100 metres
Calculate the lower bound for the straight-line distance d d\,d from the drone's starting point to its final position.
You must show all your working.
Give your answer to 3 significant figures.
