What is the equation in point slop form of the line that passes through the point (3,1) and has a slope of -2?

What is the number 321,000,000 in scientific notation? also what is the number? ?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

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?