exam Maths Puzzle Numerical Ability

Could you please help me with this problem. Thank you in advance.

On an algebra test 39 more pupils passed than failed. On a new test,
7 who had passed the first test fai

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exam Other Question

-14x = -2x^2 + 36 also, in the radical symbol, since the set-up shows b^2 - 4ac would that make the 4 negative there? thank you so much! solve: 3x/7 - 5x/3 = 2/21

21(3x/7) - 21(5x/3) = 21 (2/21)
9x - 35x = 21
- x = 21
-x/26 = 21/-1
x= =21/26

This answers is not correct; please help.