An​ individual's income varies with age. The table shows the median income I of individuals of different age groups within the United States for a certain year. For each age​ group, let the class midpoint represent the independent variable x. For the class​ "65 years and​ older," assume that the class midpoint is 69.5. Complete parts ​(a) through ​(e). Age Class ​Midpoint, x Median ​Income, I ​15-24 years 19.5 ​$10 comma 963 ​25-34 years 29.5 ​$32 comma 131 ​35-44 years 39.5 ​$43 comma 638 ​45-54 years 49.5 ​$46 comma 693 ​55-64 years 59.5 ​$42 comma 478 65 years and older 69.5 ​$23 comma 500

Use a graphing utility to find the quadratic function of best fit that models the relation between age and median income. The quadratic function of best fit is yequals

enter your response herexsquaredplus

enter your response herexminus

enter your response here. ​(Type integers or decimals rounded to three decimal places as​ needed.)