Felicity earned $25 at a bake sale on Friday. On Saturday, she sold 25 brownies at 50 cents each. On Sunday she bought new baking supplies for $18. How much money did she have left after buying the baking supplies?

Luigi is the first person to finish a 5k race and is standing 13 feet beyond the finish line. another runner, mario, is still running the race and has approximately 24 feet before he reaches the finish line. what is the distance between mario and luigi? explain through words, numbers or pictures how you found the answer.