exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (11, 16) and (4, 9).

I have a slope of 9

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exam Other Question

Question:
Take a Parallelogram ABCD.
Find out the mid points of all sides denotes it P,Q,R,S and joint it, we have a figure on PQRS.
To prove that PQRS is a Rhombus. Use the graph of y=-x^+4x+5 to answer the following:
-x^+4x+5=0 explain how you obtain your answers by looking at the graph:
Does this function have a maximum or minimum?

I do not understand how to look at a graph and tell anything -