Identify the domain and range of the following relations.

{(2,5),(4,21),(-8,-8),(-15,5)}

{(7,5),(3,21),(-1,6),(5,7)}

{(-2,-4),(-4,2),(4,-4),(1,5)}

{(2,5),(2,2),(4,8),(5,5)}

{(5,9),(8,2),(7,8),(1,3)}

Can someone, me with this.i really need with this

Evan walked 5/8 mile to his friends house.then together they walked 7/12 mile to the movie theatre.which pair of fraction can evan use to find how far he walked in all?

Sound travels about 750 miles per hour. a) suppose it takes about 1.5 seconds to hear the echo. how far away is the canyon wall, in feet? for this i got 825 ft b) suppose you stand 1,925 feet from the canyon wall and sound the horn. how long will it take to hear the echo? (i'm stuck on this)