Help me im not mentally gifted in math.

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

Find the value of x that will make l ll m

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 i need !