Mari is standing 50 feet from the base of a building. from where he stands, the angle formed between the top of the building and the ground at his feet is 60°.

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

15 points ! ~ see if you know the answer to both you!

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?