exam Maths Puzzle Numerical Ability

s^2-13s+42=0

a^2+2a-35=0

v^2-15v+54

v^2+12v+27=0

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exam Other Question

I would like you to help me with this problem: 5x-9y=11, 3x+7y=19. how do you find the area of a triangle when the only given number is 5