exam Maths Puzzle Numerical Ability

For an examination there are 4 sections of questions with 100 marks each. Againt each section there are 5 levels for results . each level will add certain points . Please confirm h

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exam Other Question

find a formula for tn</sub> for the following:

0, -5, -10, -15...

1, -3, 9, -27...

2, 5, 10 ,17...
How do I find the center and radius of this problem?
x^2+y^2+10x+7=0