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The leader of the Gauls was afraid that the Romans might hear the men climbing the hill.And so he ordered all the Gauls to say nothing on the journey.That night the Gauls advanced so silently that the Rom...

While I doubt students will ask this exact question, think it provides the basis for what are usually the most difficult questions in GCSE papers, and students would usually be unsure where to start. My i...

First use the substitution to find du/dx which is 2x. From this we now know that dx= du/2x (just re-arranging.) Substituting that into the integral we now get (6x³+4x)/ (sqrt (u) x 2x) du. Canc...

Opportunity cost is the cost of sacrificing the next best alternative to the activity under consideration. In order to explain this I will use a literal example. You are going to watch a football match. T...

This question can be split into two parts, the first is calculating overall resistance: in series the R_total = R₁ + R₂ so here R_total = 10Ω + 20Ω = 30Ω The seco...