Simplify.

7x^3 - 4y^2 -9x^3+3y^2

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 =

True or false look at the picture pls : /

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?