Which set of measurements would create a triangle?

a.
2 cm, 4 cm, 6 cm

b.
5 cm, 6 cm, 7 cm

c.
6 cm, 8 cm, 15 cm

d.
7 cm, 8 cm, 16 cm

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?

This is different from the first one can someone me

Is this a polynomial function? i need to know asap