The table shows the total personal income in a country (in billions of dollars) for selected years from 1960 and projected to 2024. Complete parts (a) and (b) below. a. These data can be modeled by a quadratic function. Write the equation of this function, with x equal to the number of years after 1960. y=()x2+1x+ (Type integers or decimals rounded to three decimal places as needed.) b. In whakyear does the model predict the total personal income will reach $25.548 trillion