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The best approach to this problem is using a Venn Diagram. The first step to solving this problem is calculating the number of students who study Spanish or German or both. In the question we are given th...

The best way to approach this is to begin by working out what 1% of 450 would be:450 is 100% of 450So to work out what 1% of 450 is:450 ÷ 100 = 4.5Now we know th...

Well in a binomial expansion we need to remember the formula (1+x)^n = 1 + nx + (n(n-1)(x^2))/2! + (n(n-1)(n-2)x^3)/3! + ... (I can draw this out properly on the whiteboard app)There is another formula bu...

√(4x⁸) = √4 x √(x⁸) = 2 x (x⁸)^1/2 = 2x⁴
Remember that (xⁿ)^p= x^np.

A good way to approach this question is to first expand the brackets . This gives 12x² - 21x + 20x - 35 (remember to take the negative seven into account). We can then simplify this to give 12x...