Katy gave half of her collection of cards to her friend. Then she gave fourth to her brother. She still have 75 left. How many does she have

Which point lies on a circle with a radius of 5 units and center at p(6, 1)?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items