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Firstly, ser and estar both mean 'to be'. When followed by a gerund, we always use estar. Eg: "La chica está cantando"The choice of the verb depends on many f...

The stationary points of the function are the points at which the gradient is equal to 0. (If you draw out a standard y=x^3 graph, you can see the gradient is 0 at the points where the graph changes direc...

In this question we are looking for a solution to x where the equation will equal to 0.We can first try factorising this, in the framework: (x+a)(x+b). Remembering the method of FOILS (first, outer, inner...

Price elasticity of demand (PED) is how demand of a good/service changes as the price of the good/service changes.As a formula: % change in quantity demanded / % change in pricePED < 1 means the quanti...

In order to find the coefficient we need to know which term of the binomial expansion is constant. We know the expression to find the coefficient is (8Cn)(2^n)((1/4)^(8-n)), where n is the power ...