After selling a dozen copies of daily newspaper, a newsstand had fewer than 75 copies left. how many copies did the newsstand have at the beginning of the day?

Prove that quadrilateral is a rhombus.

Solve the triangle. a = 21°, c = 105°, c = 5

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?