X ÷ 3 – y ÷ 6 + z ÷ 9
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In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

The kw for water at 0 °c is 0.12× 10–14 m2. calculate the ph of a neutral aqueous solution at 0 °c.

If a sample of radioactive isotopes takes 600 minutes to decay from 400 grams to 50 grams, what is the half-life of the isotope?