exam Maths Puzzle Numerical Ability

Hi,
how do I represent the following on a Pie Chart:

Four Football teams each have the following Goal Difference;

Blue Team GD +14

Red Team GD +23

White Team GD -5

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exam Other Question
What is the initial pivot column for?[1 ½ ¼ 0 30]
0 1 -1/2 1 20
0 -3 -2 0 5
And what is the initial pivot elemen CAN 3 PLANES CAN INTERSECT IN A POINT