Solve this Equation

-9 + __ = -3

In a box lenght 1m breadth 60 cm and height 40 cm small rectangular packets of dimension 5 cm into 8 cm into 10 cm are packed. how many such small packets can be packed in the big box?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Factor the expression using the gcf. the expression 21m−49n factored using the gcf