How did you completely factor the sum and diferrence of two cubes?

Suppose you do not know yet the cost per piece or unit of each ingredient. how will you represent this algebraically?

Draw a square with 8,9,16 and 15 as corners. add the numbers on opposite corners. what do you find? ​

The 7nternal dimensions of an open wooden box are 12.6 cm by 10.7 cm by 8.4 cm high. if the wood used in making is 9 mm thick, what is the external dimensions of the box?