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

The owner of a health-food store sells dried apples for $1.20 per quarter-pound, and dried apricots for $1.80 per quarter-pound. How many pounds of each must he mix together to get 20lb of a mixture that sells for $1.68 per quarter-pound? can someone check my answers, QUESTON: Simplify the following expressions by combining as many terms as possible.
3xy+5xy
my answer 8xy
9X^2T-7X^2T
my answer 2x^2t
2xy+6y+8xy
my answer 16xy
thanks