15 points + BRAINLIST For 8 & 9, at what price is a 25% off coupon equal to $7.50 off the price. You must use algebra to show the answer.
If you just give me a number you will get 0 points. This is worth 2 points.

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Graph the system of inequalities presented here on your own paper, then use your graph to answer the following questions: y < 4x − 8 y is greater than or equal to negative 5 over 2 times x plus 5 part a: describe the graph of the system, including shading and the types of lines graphed. provide a description of the solution area. (6 points) part b: is the point (5, −8) included in the solution area for the system? justify your answer mathematically. (4 points)