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100

 An integer

What is positive or negative number?

100

13+ (-1/4) x 2

what is 25/2? 

100

14 + (-1/2) x 3

what is 25/2? 

200

3 + (-4) x 4 + (-3) 

what is -16? 
200

5 + -19 + 13

what is -1?

200

12 x 3/4 + -1/2

what is 17/2? 

300

15 + (-9) x 14 + 5

what is -106?
400

negative + positive = 

what is negative? 

500

bob is above or below sea level at 

2 + -16 x -13

what is above and 210?