If y varies directly as x, and y is 400 when x is r and y is r when x is 4, what is the numeric constant of variation in this relation? 10 40 100 198 I NEED HELP ASAP

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

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

Which are forms of frozen water? check all that apply. dew frost hail rain sleet