How can u simply 3/7 to its lowest terms

The graph below shows the line of best fit for data collected on the number of cell phones in cell phone cases sold at the local electronic store on four different days

6. sarah saved $12.75 every week for a number of weeks, w. she received an additional $25 during the last week in which she saved money. write and solve an equation to find the number of weeks, w, for which sarah had saved money if she has $114.25 now.

Two jars each have one red marble and one blue marble in them. you choose one marble randomly from each jar. which model does not represent the sample space for this experiment?