The sum of 6 and x. What is the algebraic expression?

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(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.

Two numbers have a sum of -19. one number is x. what expression represents the other number?