Pls help im confused D:

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6

The hockey team has been great! in 2008 they won 20% more games than in 2007. in 2009 they won 50% more games than in 2008. what was their overall percentage increase from 2007 through 2009?