A=12(a+b)h\displaystyle A = \frac{1}{2}(a + b)hA=21(a+b)h
Work out the value of A A\,A when a=7a = 7a=7, b=6b = 6b=6 and h=10h = 10h=10
108 exam-style questions on Edexcel GCSE Maths Substitution. Each one has a worked solution and a mark scheme showing where the marks go.