Which of the following expressions represents the distance between -2 and 1?

A: |1+(-2)|

B:|-2-1|

C: None of the Above

Please explain how I can get the correct answer for questions like these.

Annie walked her dog 2 1/4 miles from her house to the dog park and 3/7/8 miles around the park.then she walked the same distance home.how many miles did she walk in all?

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Which of the following circles have their centers in the third quadrant? check all that apply.