exam Maths Puzzle Numerical Ability

log2^(x+4)- log2^(x-4)= log2^5

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exam Other Question

Graph the solution set.
x+3y>6
x>=-3
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