Each sunday, mario weighs himself. here are his weight changes over a 4-week period. week 1 2 3 4 weight change (in pounds) –2.3 +0.5 –1.2 –0.6 how much has mario's weight changed over the entire 4 weeks?
a. –5.6 pounds
b. –3.6 pounds
c. –4.6 pounds
d. 3.6 pounds