Which of the following is the best estimate of 12 18/21? A. 12 B. 12 1/2 C. 13 D. 13 1/2 I NEED HELP PLS

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

The step function g(x) is defined as shown. what is the range of g(x)? ***answer choices in picture.

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)