4cans for $2.48 how much does 1 cost?

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

Select the correct answer from each drop-down menu. the length of a rectangle is 5 inches more than its width. the area of the rectangle is 50 square inches. the quadratic equation that represents this situation is the length of the rectangle is inches.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.