exam Maths Puzzle Numerical Ability

The number of straight lines (n) that can connect (p) points is given by the eqaution n= p(p-1)
-------- How many points has a figure if only 15 lines can be

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exam Other Question

can someone please help me with this problem:

Is this a function:

x + y = 12


a. yes
b. no
c. it depends
d. none of the above
Ok I have two questions that I have tried to work out but I keep going in circles..please help!
12. (3/x^2-5x+6)-(5/(x-2)^2)

28.{(1/x+h)-(1/x)/h}