How do you find the derivative of f(x)=cos(x)f(x)=cos(x) ?

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.

Write the function for the graph. (1.8) (0,4)

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose