exam Maths Puzzle Numerical Ability

I have to combine if possible...Do not use a calculator or a table of square roots...Can you help me please?

Page 530
Number6
square root 5 - 3square2w - square 50w

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exam Other Question

The lateral edges of a regular hexagonal pyramid are all 20 cm long, and the base edges are all 16 cm long. To the nearest cm cubed, what is the volume of this pyramid? To the ne wrie an equation parallel to the given line. write an equation perpendicular to the given line:

y = 1/3x - 2