Need to Know QUICK, please help

Find the domain of the following expression: 1/(√x)-2

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.

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?