exam Maths Puzzle Numerical Ability

P is the midpoint of QR and line ST, and line QR is congruent to line ST.
Write a paragraph proof to show that PQ=PT.

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exam Other Question
The measure of the vertex angle of an isosceles triangle is 3 times as large as the measure of each base angle. find the measure of each angle of the triangle I need help with answering these question for the linear model.
year % on the y axis and year on the x axis
2003 3.4
2004 11.8
2005 19.2
2006 26.5
2007 32.6
2008 40