How do I calculate negative powers?
The power of a number indicates how many times that number must be multiplied by itself. If the power is a negative, this means that the number (or the base) is a fraction, with the base as a denominator. For example, 10-1 = 1/10. For more difficult numbers, e.g. 8-5, this is the same as saying 1/85, or 1/40.
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When solving two simultaneous equations, when should you use the method of elimination and when would you use the method of substitution?
Solve the simultaneous equations: 2x - y = 1, 3x + y = 14
Jodie buys 12 cans of cola. There are 330 ml of cola in each can. Rob buys 4 bottles of cola. There is 1 litre of cola in each bottle. Rob buys more cola than Jodie. How much more?