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

log2^(x+4)- log2^(x-4)= log2^5 Please help me I can not understand this problem this is from a worksheet.And the question is, Rewrite the equation 2x-3x=-6 as a function of x.Thank you in advance.