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Question: There are 10 boys and 20 girls in a class. The class has a test. The mean mark for all the class is 60. The mean mark for the girls is 54. Work out the mean mark for the boys.Answer: total mar...

Any odd integer can be represented by 2m+1 for some integer m (can prove that 2m+1 is always an odd number if needed). (2m+1)²=4m²+2m+2m+1=4m²+4m+1=4m(m+1)+1 simple factor...

In complete combustion, there is a sufficient supply of oxygen which is able to react with the burning hydrocarbon allowing the reaction products H₂O and CO₂ to be formed.
In in...

To achieve top marks when tackling an 'explain' question, it is important to not only have 3 reasons for why something happened, but also to prioritise and link these reasons. For example, it is not enou...

x= 9/2y= -3/2