4hd = 3f - 9. solve for d

Sasha delivers newspapers to subscribers that live within a 4 block radius of her house. sasha's house is located at point (0, -1). points a, b, c, d, and e represent the houses of some of the subscribers to the newspaper. to which houses does sasha deliver newspapers?

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?

What is the surface area of the sphere?