Can any one help me i really really need it

Which expression gives you the distance between the points (5,1)and(9,-6)

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?

Sam is picking fruit from a basket that contains many different kinds of fruit. which set of events is independent?