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Why do the denominators have to be equal when adding fractions, but not when multiplying them?

When adding fractions we need to make sure that we're adding numbers that are in the same proportion.Take for example 1/2 add 1/2, if we simply added the numerator and the denominator we would get 2/4 - whic...
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Answered by Jacob S. • Maths tutor
3358 Views

Explain what an enzyme is and the lock and key hypothesis.

An enzyme is a biological catalyst that ensures important certain chemical reactions can take place. They speed up the rate of a reaction without being used up or changed. Maltase is an example of an enzyme ...
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Answered by Annie H. • Biology tutor
11801 Views

When to use commas while writing in Polish?

When we consider writing a comma, it will usually be just before the conjunctions. We DON't use commas before: i, oraz, tudzież, lub, albo, bądź, czy, ani, ni. Also when 'a' is used as an equivalent of 'i' -...
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Answered by Aleksandra C. • Polish tutor
4313 Views

What is the difference between the subjunctive and the optative moods in classical greek verbs?

The subjunctive mood is used to express a hypothetical situation, something that is not real (e.g. a possibility or an action that has not yet happened). The optative mood is used to express wishes and hopes...
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9791 Views

How do I compare two sources?

There are lots of different things to consider when looking at sources: first you want to read through them, and look at the authorship and date, as that will give you some clues as to any differences you sp...
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Answered by Beatrice B. • History tutor
5200 Views