exam Maths Puzzle Numerical Ability

show how three lines in a plane can intersect in no points,exactly one point ,exactly two points or exactly three points

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For f(x) = 5 - 3x and g(x) = x2 - 1, find f(g(x)) and g(f(x)).

thanks A light plane flew from its home base to an airport 255 miles away. With a headwind, the trip took 1.7 hours. The return trip with tailwind took 1.5 hours. Fine the average airspeed of the plane and the average wind speed.