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To begin answering this question create a small grid

put 5 on the left hand side and put 2x and -6 seperately at the top of the grid

then you can multiply 5 by 2x to gain 10x and multiply 5 ...

Distance = 4 x 85 = 340km

Average speed = 340 / 5 = 68 km/h

So this question wants you to rearrange the formula so that b is on its own on one side of the equals sign. As its a formula and not asking for the value of the equation you don't have to worry about solv...

You can use the price of each pack and divide it by the number of bags of crips to get the price per packet, the one with the lowest price per packet will be the best value for money.

The small pac...

A 15% increase means that the £80,000 represents 115% of the original value.

Therefore what we do is:

£80,000=£125% divided by 125 

...