Can anyone help me out with these problems? Trigonometry is not my strongest and even with an explanation from my teacher it's still too confusing

Arestaurant charges $100 to rent its banquet room for an event. it also charges $15 to serve dinner to each guest. write an equation for the total cost of the banquet room in terms of the number of guests. deine your variables. what is the total cost of the banquet room for 20 guests?

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11

The length of the line segment joining the midpoints of sides ab and bc of the parallelogram abcd is 10. find the length of diagnol ac