Help pls this is physical science (9th grade )

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Acontrol during an experiment. might change remains constant does not exist does change