If a hill is 1,000 feet in elevation, and a stream flows down to 250 feet in elevation before it empties into a lake, what is the gradient if it covers a distance of 1 mile?

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?

Hey! can anyone me out with my homework? it will be very much appreciated! and !

What is most often given a value of zero to describe an object’s position on a straight line? displacement reference point distance ending location