A circular running track is 14 mile long. Elena runs on this track, completing each lap in 120 of an hour.

5 mph

Step-by-step explanation:

speed = distance/time = (1/4)/(1/20)= 20/4= five mph

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb