Derek uses a $50 gift card to purchase 3 books for $12 each and a calendar for $9. Which expression represents the amount of money left on the gift card? A 50 123 9 B 50 3(12 9) C 3 12 9 D 50 3 12 9

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points

Simplify the given expression leaving the answer in improper fraction form. 2/3+5/6