Each Sunday, Mario weighs himself. Here are his weight changes over a 4-week period.

Week 1 2 3 4

Weight Change - 1.8 + 0.9 - 1.4 + 0.4

How much has Mario's weight changed over the entire 4 weeks?

A.

1.9 pounds

B.

-4.5 pounds

C.

-1.9 pounds

D.

4.5 pounds

Solve the system of equations. 3x+5y=9 3x+2y=3

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