I'm so confused on this question, I need help

How do you determine whether a relationship represented as as graph is linear or nonlinear

What is another way to express 36 +32

Meghan has created a diagram of her city with her house, school, store, and gym identified. a. how far is it from the gym to the store? b. meghan also wants to walk to get some exercise, rather than going to the gym. she decides to walk along arc ab. how far will she walk? round to 3 decimal places.