book Maths Puzzle Numerical Ability

when can you measure the outside of a triangle to find the height?

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book Other Question

Convert the measure, round your number to the nearest tenth.

65 lb/ft cubed to kg/L (1 kg is about 2.205 lb; 1ft cubed is about 28.3L)
I cannot understand how to preform this
Are these lines paralell, perpendicular or neither? -2X +Y=10 and 4X-Y=5. show all workings
thanks