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How effective was the nuclear arms race in restraining the aggression of the superpowers in the years 1955 to 1963?

This is a common A2 exam question for those studying the Cold War. When tutoring a student, I would identify their course and study the mark scheme for the board they are being examined with and frame their ...
GS
Answered by Georgia S. • History tutor
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Find the coordinates of the stationary point of the graph y = 3x^2 - 12x

Firstly, we need to differentiate the equation to find an equation for the gradient of the line.dy/dx = 6x-12We know the original graph was quadratic, and therefore only has one stationary point. This is whe...
JM
Answered by Jack M. • Maths tutor
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With the aid of a diagram describe the events occurring in the neurone leading to the establishment of an action potential

Voltage-gated Na + channels and Voltage-gated K + channels are closed at rest, Once a stimulus is applied, the neurotransmitters activate chemically-gated (CG) channels within the cell membrane. CG Na + chan...
OY
Answered by Olga Y. • Biology tutor
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Find the Taylor Series expansion of tan(x) about π/4 up to the term in terms of (x-π/4)^3.

Firstly, set f(x) = tan(x). We can then differentiate this 3 times in order to find f'(x), f''(x) and f'''(x). This will require use of the chain rule and the product rule. We can find:f'(x) = sec 2 xf''(x) ...
JM
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w and x are whole numbers. w >40, x<30. Work out the smallest possible value of w-x.

To get the smallest value of w-x we will need the smallest value of w and the largest value of x.Our smallest possible value of w=41.Our largest possible value of x=29.So the smallest value of w-x = 41-29 = 12
EG
Answered by Esme G. • Maths tutor
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