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How should I tackle an essay question to receive top marks?

Essay questions are a very tough, but very common section of any A-Level exam. My first tip is to look at the question as a broad outline, so if the question is along the lines of "to what extent did A ...
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Answered by Liam P. • History tutor
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How can we write a C++ program to add two numbers?

To write a C++ program that adds two numbers we need to write the following code: We write a line which calls a library that has functions we need: #include (Then we create a function that does our sum:) int...
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Answered by Cosmin B. • TBA tutor
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The ratio between the molar mass of an alkene(A) and an alkyne(B) with the same number of carbon atoms is 1.05. Find the molecular formulas of the two hydrocarbons then write the reaction for how we can obtain the alkene A from the alkyne B.

We start by remembering the general formulas of alkenes and alkynes: Alkenes - C n H 2n Alkynes - C n H 2n-2 We calculate the molar mass of both of these using the fact that the atomic mass of carbon is 12 a...
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Answered by Cosmin B. • Chemistry tutor
9990 Views

How can we calculate the derivative of function f(x)= (x+2)/(x-1)?

In order to calculate the derivative of the given function, we need to apply the laws of derivation. Therefore: f '(x) = ((x+2)/(x-1))' f '(x) = [(x+2)' * (x-1) - (x+2) * (x-1)' ]/ (x-1) 2 f '(x) = [ 1 * (x-...
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Answered by Cosmin B. • Maths tutor
5635 Views

How can we solve a two-equation, two-unknown values?

If we have two equations that look like this: a1 * x + b1 * y = c1 and a2 * x + b2 * y = c2 where x,y are variables and a1,a2,b1,b2 are coeficients. then we solve it using the following method: We choose eit...
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Answered by Cosmin B. • Maths tutor
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