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C_nH_2n+2C₇H₁₆Heptane

There are 7 main word classes, so let’s focus on those for now. They are: Nouns, Pronouns, Verbs, Adverbs, Adjectives, Prepositions and Determiners. You can work out which class a word belongs to using bo...

T=(2B-A)/3

You want to show the examiner that you have a good command of grammar and a varied vocabulary. So I would suggest including at least three hobbies and using a different verb each time you talk about a hob...

We use integration by parts. Set $u = x$ and $dv/dx = e^x$. This leads to $du/dx = 1$, and $v = e^x$. Then:\begin{align*}\int xe^x \mathop{\mathrm{d}x} &= xe^x - \int e^x \mathop{\mathrm{d}x}\&= x...