A landscaper charges $30 for each job plus an additional $20 for each hour worked. Write an expression to represent the total cost of a landscape job. Explain what the variable used in the expression represents. Explain how you identified the operations used in the expression.

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas is (0,-12). the y intercept of the second parabola is (0,-24) what is the positive difference between the a values for the two functions that describe the parabolas