Scientists are monitoring a whale's weight by observing its weight change once a week, over a 4 week period. how much has the whale's weight changed over the entire 4 weeks?

Option D. -3.9 will be the answer.

Step-by-step explanation:

Change in weight of the whale in first week = (-2.1) pounds

Change in weight of the whale in second week = (+0.3) pounds

Change in weight of the whale in 3rd week = (-1.7) pounds

Change in weight of the whale in 4th week = -0.4 pounds

Total change in weight over the period of 4 weeks = - 2.1 + 0.3 - 1.7 - 0.4

= -3.9 pounds

Therefore, Option D. -3.9 will be the answer.

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step-by-step explanation:

answer for #1 is c

answer for #2 is d

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