The united states uses 24% of the world's supply of energy. what fraction of the world's energy is

Iam so stuck. what is the worked out answer for this question?

Small kingdoms on the iberian peninsula fought to take land back from the moors during which event? the hundred years’ war the wars of the roses the reconquista the great schism

Asquare parking lot has 6,400 square meters what is the length in meters