exam Maths Puzzle Numerical Ability

If 15 points are arranged on a circle, how many lines are needed to join every point to every other point once?



Please help me!!


- Jordan

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exam Other Question

A car travels on the freeway at an average speed of 66 miles per hour. How many miles does it travel in 3 hours and 40 mintues? I'm having a hard time figuring these answers out. Please Help.

1.) 3x-(x+2)=5x-3(x-1)



2.) 5x-(7x-4)-2=5-(3x+2)


thank you so much!