Please answer I am very stuck on numbers not letters

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

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.

This graph shows a portion of an odd function. use the graph to complete the table of values. x f(x) −2 −3 −4 −6