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Which French verbs take 'etre' and which take 'avoir' in the perfect tense?

Luckily, there is an easy way to remember which verbs take 'être' and which take 'avoir' in the perfect tense. You just need to learn the following acronym: M - mourir R - retourner S - sortir V - venir A - ...
IT
Answered by Isobel T. • French tutor
5263 Views

What adaptions can a neurone have in order impulses to be transmitted faster?

A neurones role is to transmit electrical impulses rapidly around the organisms body so that the organism can respond to changes in both their external and internal environments. Their structure consists of ...
BB
Answered by Brogan B. • Biology tutor
3207 Views

The function f is defined for x > 0 by f (x) = x^1n x. Obtain an expression for f ′ (x).

By taking the natural log on both sides we can see that: ln(f(x)) = ln(x)^2 This is a more familiar expression that we know how to differentiate LHS: f '(x)/f(x), RHS: 2*ln(x)/x By rearranging this we can se...
SE
3189 Views

Given that y = 8x + 2x^-1, find the 2 values for x for which dy/dx = 0

First differentiate y with respect to x, which gives you dy/dx = 8 - 2x^-2. This needs to equal zero so equate to zero. 8-2x^-2 = 0. You can then bring the 2x^-2 to the other side giving 2x^-2=8. Dividing bo...
RB
Answered by Rosemary B. • Maths tutor
4338 Views

What is the reflex arc and how does it protect us?

The reflex arc is a pathway that contorls a reflex action. Reflex actions are very fast (milliseconds fast) which can help in dangerous situations. For example, if I touch a hot pan, the reflex would be me w...
BC
Answered by Betsy C. • Biology tutor
6534 Views