exam Maths Puzzle Numerical Ability

Why does multiplying two negative numbers equals a positive number?

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exam Other Question

Solve by the substitution method
3d+e over 4 = d+1 over 2
d-e over 4 = 1

If anyone can answer this problem I would greatly appreciate it. Please and Thank You the perimeter of a rectangle can be found by using the formula p= 2l+ 2w where l is the length and w is the width of a rectangle. what is the width of a rectangle with a perimeter of 50 meters and a length of 16 meters?