What is the inverse of -1/2x+5

Sum of the interior angles of a pentagon

Find the value of the variable and the length of each chord for #5 and #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?