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So this function is the product of two functions of x, so we use the product rule to differentiate it. The rule states if y=uv, dy/dx=(du/dx)v+(dv/dx)u. In this function we assign u=(4x+1)³ and...

It's important to make sure you're hitting all the relevant assesment obectives in every paragraph in order to reach those top marks. For essays I always find the formula 'Point, Evidence, Analysis, Link'...

Before answering any essay question it is vital that you take a few moments to look at it and try to dig beneath the surface of what is wanted. This question is clearly a synoptic essay question and for t...

Kidney dialysis

When the concentration of urine is low, the blood will reabsorb more water from the collecting duct. This is via the action of ADH increasing the permeability of the collecting duct walls (via aquaporins)...