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First you want to find out how many coins there are in bag A. So how many 20p coins do you need to make £7.20? This is the same as 720p. 720 divided by 20 is the same as 72 divided by 2 which is 36. So...

This is like solving 2 simultaneous equations. Both equations are in a form of y=ax^2+bx+c. Equate both equations together and you got:
3x²+5x+12 = 3x-8

Put both polynomi...

A neat trick to remember what we do to the powers when integrating and differentiating is that we INcrease the power when we INtegrate, and D...