exam Maths Puzzle Numerical Ability

How do yu solve this by using quadratic formula 2 = 0.7n + 0.6n2?
please show steps.

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exam Other Question

Can someone help me with this problem?

I need to divide. and write the result in simplest form:

9/10 divided by 12/5

Thanks,
Lyn Find the sum of the measures of the interior angles of a convex polygon with the given number of sides.

Number of sides-->4

Correct answer would really be appreciated:)