Which expression is equivalent to -4m + 6.4?

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 table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.