1) 14 + (-25) + (-4) + (+15)= 14 - 25 - 4 + 15= -11
2) -3.9 + (+1.2) + (-6.1) + (2.8)= -3.9 + 1.2 - 6.1 + 2.8= -6.8
3) -7/12 + (+1/8) + (-5/12) + (+3/4)= -7/12 + 1/8 - 5/12 + 3/4= -28/48 + 6/48 - 20/48 + 36/48= (-28 + 6 - 20 + 36)/48= -6/48= -1/8
1) 14 + (-25) + (-4) + (+15)
= 14 - 25 - 4 + 15
= -11
2) -3.9 + (+1.2) + (-6.1) + (2.8)
= -3.9 + 1.2 - 6.1 + 2.8
= -6.8
3) -7/12 + (+1/8) + (-5/12) + (+3/4)
= -7/12 + 1/8 - 5/12 + 3/4
= -28/48 + 6/48 - 20/48 + 36/48
= (-28 + 6 - 20 + 36)/48
= -6/48
= -1/8