Last summer, Marissa decided to measure change in a swimming
pool's water level each week. There was a rainy spell that lasted 2
weeks and the water level rose the following amounts each week
Marissa measured the level: 20 millimeters in the first week and 15
millimeters in the second week. Model the changes as a sum of
integers.

Last summer Marissa decided to measure change in a swimming pools water level each week There was a rainy spell that lasted 2 weeks and the water level rose the class=