exam Maths Puzzle Numerical Ability

hi,
does a pie chart always have to add up to 100%?

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exam Other Question

What are the solutions of the following?
(x - 5)(x + 3) = 0

a. 5 and -3
b. 5 and 3
c. -5 and -3
d. -5 and 3
Can you help me with the expression please?!

3/x^2+4x+3 - 1/x^-9

THANK YOU!!