Writing+expressions+and+formulae

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2. Exercise 11 & 12
 * Questions 1-4 on page 192-3
 * Questions 1-3 on page 196

3. Challenge - Make //h// the subject of these formulae
 * //A// = 1/2//bh//
 * //A =// 1/2//(a + b)h//
 * //V = lbh//
 * //V// = 1/3 //Ah//