Function or not? {(2,4)(2,-6)(3,-1)}

Ahome improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour. if a customer rented the truck at 11: 10 am and returned the truck at 1: 40 pm the same day, what would his rental cost be?

Bring the fraction a/a-4 to a denominator of 16-a^2

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form