If s = the number of students in a pe class which algebraic expression represents the phrase? half of the number of students

Ill mark the brainliest if you me with the these three questions 7,8,9

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.