book Maths Puzzle Numerical Ability

If two lines are cut by a transversal so that alternate interior angles are

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PLease help!
The question needs to be explained step by step so I can explain and understand it for a project please?

Find the midpoint of the line segment PQ for P(2,-2), Q(3,4)

Thank you for your help.
Denise slove this equation 3q+11+8q>99