For each ordered pair, determine whether it is a solution to 7x - 4y= -5.

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

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

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min