Scientist are monitoring a whales weight by observing its weight change once a week, over a 4 week period. how much has the whales weight changed over the entire 4 weeks (week chart) weight change in pounds. week 1. -2.1 week 2. +0.3 week 3. -1.7 week 4. -0.4 (answeres) a. -3.9 pounds b. 4.1 pounds c. 0.3 pounds d. -0.1 pounds ( answer i need 30pts )