16. 16+9y-14y^2-15y^2-6y-16y^2

To simplify the expression, we need to combine like terms. Let's rewrite the expression and group the terms with the same variable:<br /><br />$16 + 9y - 14y^2 - 15y^2 - 6y - 16y^2$<br /><br />Now, let's combine the like terms:<br /><br />$16 + (9y - 6y) - (14y^2 + 15y^2 + 16y^2)$<br /><br />Simplifying further:<br /><br />$16 + 3y - 45y^2$<br /><br />Therefore, the simplified expression is $16 + 3y - 45y^2$.