book Maths Puzzle Numerical Ability

Can you please tell me how to find a geometric formula for finding the number of lines that can be formed in a given number of pts.?example:Given 6 points, how many lines can be fo

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book Other Question

Sally has $32,000, she invested part at 9% return and the remainder at 11% return. Her total return was $3200, what is the investment breakdown? How do you set this equation? How do I re-write this equation using the distributive property?
6( 80 + 1). My ans. is 6 x 80 + 6 x 1