A polyhedron has 20 faces and 30 edges
How many vertices does it have?​

there are 12 vertices

Explanation:(V = 12), 30 edges (E = 30) abd 20 faces (F =20)

a.) d-day invasion of normandy.

hope this !

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.