Which of the following is the radical expression of?

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 =

What is the simplified expression for 6(2(y+x))

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base