Function or not a function?

i just need a simple yes or no! ;-;

Beth took out a $20,000 loan for college she is borrowing money from two banks. bank a charges an interest rate of 8.5% bank b charges and interest rate of 10.5% after one year alice owes $1860 in interest how much money did she borrow from bank a

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

In angle pqr find the measure of