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What is the sum of the first n terms of a geometric sequence and where does it come from?

p { margin-bottom: 0.25cm; line-height: 120%; } Recall that a geometric progression is a sequence (a_n) defined as follows a_1 = a a_n = a * r^(n - 1) for all integers n > 1 where a and r are some fixed n...
KN
Answered by Kamil N. Maths tutor
5659 Views

What is the Krebs/TCA/Citric Acid cycle?

At its most basic, the TCA cycle is a mechanism which converts the fuel we consume - carbohydrates, fats and proteins - into special molecules called "reduced cofactors" which transport electrons t...
RM
Answered by Ryan M. Biology tutor
4213 Views

How do you form questions in French?

Forming questions can be difficult because in French they do not have an equivalent of the auxiliary 'do' which we have in English and use for asking questions e.g. do you play rugby? In French, there are th...
JH
Answered by James H. French tutor
4581 Views

What is the 'chain rule'?

The chain rule is incredibly useful when differentiating compositions of funcions. Until now you have really only met dy/dx as your derivative. By imagining dy/dx as a fraction, you can transform it into som...
JA
Answered by James A. Maths tutor
5187 Views

When do I use être or avoir in the past?

Etre is used with verbs of motion such as Aller/Entrer/ Arriver. The full list is easy to remember using the MRS VANDERTRAMP technique. M-Monter R-Retourner S-Sortir V- Venir A-Arriver N-Naître D-Descendre E...
CR
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