A small fly weighs approximately 2.2 x 103 gram and an average sized gnat weighs approximately 9 x 10+
gram.

Part A
Find the sum of the weights of the two insects.
———- Grams

Part B
How much heavier is the fly than the gnat?

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?