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Russian has many different grammar rules which are completely unknown to most English speaking people. In English if we want to refer to an object in a sentence, we may use direct or indirect article (e.g...

Pathogen: any microorganism (bacteria or virus) that can cause disease. anything that has a 'path' to disease.

 I will explain that often the question gives a clue to the answer to the question. Th...

The first thing you need to do to make this easier is to multiply out the brackets so that you can then move all the 'x' terms to one side and all the numbers to the other side. It would become: 7x=4x-32 ...

SER and ESTAR are both verbs which mean TO BE. SER is used when you are talking about things like nationality, where you are from, profession, time, price, physical traits and most importantly when descri...

Draw a diagram breaking down 110 and 132 into their multiples (on whiteboard), e.g. 110=1110 132=1112 Circle the prime numbers, 11, and then break down the composite numbers (those that aren't pr...