The balance of oxygen in earth's atmosphere is maintained primarily by which two processes?

a.
photosynthesis and respiration

b.
outgassing and photosynthesis

c.
lightning and fixation by bacteria

d.
the formation of carbonate rocks and outgassing

The equation respenting the left table is

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?

To convert celsius temperatures to fahrenheit, you can use the expression (c + 32). tom says that another way to write this expression is c + 32. what error did tom make?