Select the quadratic function that corresponds with the graph below

Math i have no idea how to do a and b

Which of the following is the sum of 3 1/6 + 6 3/8?

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.