For 6, to get the sales tax, you multiply the price of the videogame (52.99 in this case) and multiply it by 0.07 to get 3.7903 = around 3.79 dollars. For the total cost, we add the sales tax to the regular cost to get 52.99+3.79=56.78 dollars
For 7, since we need 3 (2+2/3) cuts of wood, we simply multiply (2+2/3) by 3 to get 6+6/3=6+2=8 feet. To find out how much is left, we subtract 8 from 10 to get 10-8=2 feet left
