exam Maths Puzzle Numerical Ability

(2r-3s)(4r^2+6rs+9s^2)

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exam Other Question

For the following set, which number has the largest absolute value?

4, -1, 12, -20, 19, 0

Can you show me how to figure the answer.
find the area of each polygon
-four sided polygons
-side=10cm
-side=12cm
-side=16cm

2nd polygon four sided
-side=10in
-side=24in