Help I need the answer ASAP

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 =

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression