1). 3+(10)+6
2). (-3)+3+12
3). (-3)-6
4). 3-(-2)
5). 5-3-(-2)
6). 7-(-6)-7

1) 19

2) 12

3)-9

4)5

5)4

6)6

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

no, because the sides are not congruent