Someone can help me please??

gas heating

Explanation:

the rising curves are the states rising in tempurature while the flat sequences are the states of matter actually changing. A-b is the solid heating, then b-c is the melting (changing into liquid), c-d is liquid heating, then d-e is vaporizing, leaving e-f being gas heating.

edit: typo

gas heating

Explanation:

that's all I hope it helps

wwe

answer; economic order quantity;