exam Maths Puzzle Numerical Ability

o.k. o.k. last one today I promise!

Use multiplying by 1 to find an expression equivalent to 16/7 with a denominator of 28x.
Do not simplify type a fraction

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exam Other Question

I tried using one of your solvers for the following problem and it gave me an error and said solution not found so if you could help that would be great!

Find the solution of the system

y = x^2 + 5

and

y = 2x + 4 If cotA + cotB + cotC=sqrt3 then prove that the triangle is equilateral.