I need answers for problem solving

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 =

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

7x+8y=-18, 4x-9y=-3 solve the system of equations