Could you please check my answers.

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1) - 1.8 - 3.9
a- -2.1
b- 5.7
c- 2.1
d- -5.7*

2) -7 = 5
a- -2*
b)12
c) -12
d) 2

3) -6.1 + 1.7
a-7.8*
b- -4.4
c- -7.8
d- 4.4

4) A mountain climber ascends a mountain to it peak. The peak is 12,740 ft above sea level. The climber then descends 200 ft. to meet a fellow climber. Find the climbers elevation above the sea level after meeting the other climber.

a-12,540 ft above sea level*
b- 12,540 ft below sea level
c- 10,740 ft above sea level
d- 12,940 ft above sea level

Thank you for checking my answers

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