exam Maths Puzzle Numerical Ability

tan(11)=51/b How do i get b by itself?

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exam Other Question

Determine the volume, in cubic units, of a pyramid whose base is an equilateral triangle of side length 6 and whose other edges are each of length {{{sqrt(15)}}}. Please provide a can i please get help with this?
x^2+2x-15
over
4x^2
divided by
x^2-25
over
2x-10