Where did the heaven elements that make up the bulk of earth originate:

a in a supernova
b in meteorites
c in the big bang
d in the earth itself
e in the sun

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.