Which represents a quadratic function?
Of(x) = -8x3 – 16x2 - 4x
f(x) = 3/4x2 + 2x - 5
PX) = 4/x^2-2/x +1
f(x) = 0x2 - 9x + 7

Me. i can't figure out this question. give an explanation too. .

How to simply and write the answer n a whole number

Astocks price gained 3% in april and 5% in may and then lost 4% in june and 1% in july during which month did the stocks price change the most