The variable z is invery proportional to x. when x is 3, z has the value 6. what is the value of z when x = 12

"inversely proportional," please.

z = k/x

When x is 3, z = 6; find k: 6 = k/3, or k = 18.

Then z = 18/x. When x = 12, z = 18/12 = 2/3 (answer)

it happens during combustion and impacts the environment because the plants and trees take in that and it can cause them to die.

answer by yourhope:

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