The length of a roll of fabric is 40 metres, correct to the nearest half-metre. A piece of length 8.7 metres, correct to the nearest 10 centimetres,

is cut from the roll.

Work out the maximum possible length of fabric left on the roll.

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.