What is a physical change in an aquaponics system?

Y=‐1x + 7 if y has a value of ‐24 what is the value of x?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

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