The sum of (2a + ab + 2b) + (4a2 - 3ab + 9)

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?

Two lines parallel to a third line are parallel to each other. always sometimes or never

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base