What are the rules for multiplying and dividing exponents that have the same base?

How do you use the elimination method for this question? explain, because i really want to understand!

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 10+10+20 about the origin the square root of a triangle.