Jon mows lawns in his neighborhood to earn some cash for the summer. He charges a rate of $25 per lawn. He wants to buy an Unagi electric scooter with
the money he earns. How many lawns would he need to mow in order to
make $999 plus tax?

Dana wants to identify the favorite professional baseball team of people in her community. she stands outside a local sporting goods store and asks every other person who enters, "what is your favorite professional baseball team? " will the results of her survey be valid? explain.