The Gila River started the week at a level of 10.3 feet. On Monday, it went down 1.25 feet. On Tuesday, it went up 2.35 feet. On Wednesday, it decreased 0.9 feet. On Thursday, it increased 1.15 feet. On Friday, it fell 2.3 feet. First, estimate the new level of the Gila River. Then, find the actual new level of the Gila River.

Solution:

estimate: 10.3 -1.25 +2.35 -0.9 +1.15 -2.3 = 9 feet

actual :10.3 -1.25 +2.35 -0.9 +1.15 -2.3 = 9.35 feet