To put this expression in order from least to greatest, we first need to combine like terms.
-2y - 5 + 6y² + 5y³ - 5y² + 2y³ + 4y
= (-2y - 5 + 4y) + (6y² - 5y²) + (5y³ + 2y³)
= 2y - 5 + 6y² - 5y² + 7y³
Then, we can arrange the terms in order of increasing degree:
-2y - 5 + 6y² + 5y³ - 5y² + 2y³ + 4y= -5 + 2y + y² + 7y³
So the expression in order from least to greatest is: -5, 2y, y², 7y³