exam Maths Puzzle Numerical Ability

Can anyone show me how to find the distance between points A(4, -3) and B(-4,3)

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exam Other Question

A school club has 15 boys and 16 girls as members. How many different 6- person communities can be selected from the membership if equal numbers of boys and girls are to be selected? I give it a shot 3sqrtx-5=3 how would I figure this out and how would I submit this into the solver. Please advise

Thank you.