What is the difference between equality and congruence

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

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?

What is the gcf of 20c^3-5c^4+30c^6