exam Maths Puzzle Numerical Ability

I do not understand what they mean when it asks me which linear equation is an indentity or if it is not conditional can you please show me an example?

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exam Other Question

Can you please help me solve this word problem:

An airplane traveling at 450 mph enters a region with a headwind of 25 mph. How long will it take the plane to travel 950 miles into this wind? Write equation for a parabola with a focus at (0,5) and a vertex at (0,0)