book Maths Puzzle Numerical Ability

identify the root to the nearest tenth.
y=5x^2+x+2

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book Other Question

what is 32% as a reduced fraction? (thank you for the help) my question is:
write the equation of a line passing through the points (-3,7) and (2,4).
when i did the problem i got y=3x+30/4
is that right?
thanks for helping me!