book Maths Puzzle Numerical Ability

Jane brough 15 tickets at the carnival. Short rides cost 2 tickets, medium rides cose 3 tickets and long rides cost 4 tickets. She used up all her tickets to go on 6 rides. What ar

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I am not sure if you are able to show graphing, but if so I am having difficulty with this problem.
Graph:
16x^2+25y^2+64x-250y+289=0

Thanks:) I really really need help with this one

find the measure of the fourth angle of a quadrilateral when the other three angles measure 102 degrees 84 degrees and 67 degrees