exam Maths Puzzle Numerical Ability

please help me solve this equation: {{{2=1/x^2-1/1+1/x-1}}}

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exam Other Question

if A = 1/2h(b1 + b2) find b2 if A = 30,h =6 and b1 = 7 How do you write 10.9 in Roman Numerals? I know how to write the 10, but am unsure of how the decimals are done.