Answers:
1. 147+13=160
2. -55+(-31)= -55-31=-86
positive number and negative number= -negative number
3. 18+71=89
4. -14+21=7
Positive 7 because 21 is greater than -14
5. 12+(-56)= 12-56=-44
6. -4+18=14
7. -31+(-17)=-31-17=-48
8. 72+(-22)=72-22=50
9. 47+23=70
Answer:
2
Step-by-step explanation:
this is a 30-60-90 Δ and the ratio of the sides are 1 : : 2
1 / 2 = / x
cross-multiply: x = 2