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When dividing by a fraction, it is actually a multiplication. All you need to do is flip the second fraction over. This is known as the reciprocal. In this example the fraction we want to flip is 7/12. Fl...

The most important thing is really to practice and practice even more! Practice with literally anyone - your parents, teachers, friends, neighbours and even yourself in from of a mirror. A good book that ...

1/2n² + 1/2n + 1

This is a hard one and maybe closer to a maths challenge question. It is easier to explain in person.

First common difference is 1 then 2 then 3 ...

(x - 5) / (x² + 2x - 15) 

Although both are giant covalent structures, they have different structures. Diamond makes a 3d structure with each carbon attached to 4 other carbons so the only bond to break when melting it is the very...