Can someone please helpp

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

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?