exam Maths Puzzle Numerical Ability

Can you help me with figuring out why a negative times a negative equals a positive?

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exam Other Question

Prove that an isometry preserves lines. i have a test tomorrow and im strugling can u help solve this question on my review

7n+2[3(l-n)-2(1+n)=14

another question is -10+4(3p+10)=18

one more is 66=-6/5(s+3)