A
what is the justification for the step taken from line 2 to line 3?
3x+9-7x-x+10+
-4x+9 - 2x+10
-6x-9=10
-6x=1
a. the subtraction property of equality
b. the multiplication property of equality
c. combining like terms on one side of the equation
d. the distributive property

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?