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

Find three consecutive even integers if twice the second is 12 more than the third.

I already attempted in setting up part of my key:

x
x+2
x+4

THANK YOU! If triangle XYZ is isosceles and LINE XY = YZ, find the value(s) of "A" if X(3,4), Y(4,-1)AND Z(A,-2)