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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...

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

5x2 – 2x – 3x2 + 6x – 21= 2x2 + 4x − 21

12² = 4² + x² [This is pythagoras' theorem (a² = b² + c²) ]
144 =16 + x ^2
128 = x²
11...