What is the quartile of 10,39,43,45,46,47,48,48,49,50,52

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Which speed is the fastest (use 1 mile ≈ 1.6 kilometers)? a. 12 miles/hour b. 18 feet/second c. 19 kilometers/hour d. cannot be determined

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.