What is the displacement of the GBS cross-country team if they begin at the school, run 10 miles, and finish back at the school?

Ineed the answer to question 1 , i’m desperate

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?