What’s the answer and How do you do these

What is the value of x? enter your answer in the box. photo attached.

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

Angela is buying a dress that is on sale for 20% off. if the original price of the dress is $40.00, how much money is angela saving on the dress? a. $0.80 b. $3.20 c. $32.00 d. $8.00