The scatter plot below shows the cost, y, of ground shipping packages from Harrisburg, PA, to Minneapolis, MN, based on the package weight, X.
у
Ground Shipping
30
Cost (in dollars)
Х
10
20
30
40
Weight (in pounds)
Which equation best describes the line of best fit?

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?