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A tangent makes an angle of 90 degrees with the radius of a circle.Using this fact, we find the gradient of the radius going through P = -4Therefore gradient of the tangent to the circle at P is -1/-4 = 1...

When we think of immune defences, our minds may immediately jump to white blood cells such as macrophages or T lymphocytes, however there are actually many mechanisms by which our bodies fight infection b...

This question will probably be worth around 6 marks in the exam depending on what exam board is being sat. A general rule of thumb is that if a question is worth 6 marks then 6 pieces of information will ...

Part iGravitational Potential Energy (GPE) = mass x gravitational acceleration constant x heightGPE = 2 x 9.81 x 10 = 196.2JPart iiConservation of energy states that the sum of the GPE and K...

We want to show that this gives an even number, so we need to get it into a form that it is 2 multiplied by some positive integer. We start by expanding the (n-2)² out, remember that (n-2)^...