What is the value of the expression 9-y/-6 when y = –21?

Which statements are true? see picture

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

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?