Simplify the rational expression and find the excluded values. 6d²c/3c

Timed*** there are 8 rows and 8 columns, or 64 squares on a chessboard. suppose you place 1 penny on row 1 column a, 2 pennies on row 1 column b, 4 pennies on row 1 column c, and so on … how many pennies are on each square? a =   b =   c = d =   e =   f = g =   h =

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length