If you help me you get 20 points

Iwill make brain if you me correctly fill this out needs due today pls and send it back to me (click the link and you will get it)

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.