This is probably easy, but I'm not smart so help Jeff is building a circular plaque with a radius of 8 inches. He wants to cover about half of the plaque in circular rhinestones. If each rhinestone has a diameter of 0.5 inches, approximately how many rhinestones will he need?

Plz heeeeeeelp plz give me the answer

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4