A bag contains 7 marbles: 4 red, 2 yellow, and 1 green. Three marbles are to be selected from the bag, one at a time, without
replacement. If the order of selection does not matter, how many
color combinations of the three marbles are possible?

Ineed to know the answer to this algebra question.

Stacey filled her 1/2 cup of measuring cup seven times to have enough flour for a cake recipe how much flour does the cake recipe calls for

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field