What is the percent decrease from 9,000 to 0

Ineed with this problem 21 show steps

Acampus club held a bake sale as a fund raiser, selling coffee, muffins, and bacon and eggs sandwiches. the club members charged $1 for a cup of coffee, 3$ for a muffin , and $4 for a back. and egg sandwich. they sold a total of 55 items , easing $119. of the club members sold 5 more muffins than cups of coffee, how many bacon and egg sandwiches he’s did they sell

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.