Oliver bought a scarf that costs 8 dollars and a watch that costs 9 dollars. At the counter he received a discount. If he paid only 13 dollars, how many dollars was the discount?

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

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?