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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 ...

Answered by Liam P. • History tutor

4097 Views

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...

Answered by Cosmin B. • TBA tutor

2547 Views

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_nH_2n
Alkynes - C_nH_2n-2
We calculate the molar mass of both of the...

Answered by Cosmin B. • Chemistry tutor

9662 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

Answered by Cosmin B. • Maths tutor

5151 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 fol...

Answered by Cosmin B. • Maths tutor

5608 Views