- Give the exact value of the expression without using a calculator. cos(arctan(-7))?

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CH4 was collected over water at 25.0C and 720torr. The volume of the wet gas is 2.50L. What is volume of dry methane at standard pressure? Write the english phase as an algebraic expression. Let x represent the number. The difference of three and half of a number? Please help I've been stuck on this for days!? Why is the answer A? (chem)? Is there any genetic evidence of koala and wombats being related? i have science project due and i need genetic evidence?