exam Maths Puzzle Numerical Ability

Hi can you please show me how to find the distance between the parallel lines
:y=2x-4 and y=2x+1
Thank you
Nicole

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exam Other Question

(30,000,000/N)*E=60,000,000 A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s.

When will the ball reach a height of 80m?

I would appreciate help with this one. Thank you!