Let X = F(X) be a planar system with no equilibrium points. Suppose the flow φt generated by F preserves area (that is, if U is any open set, the area ofφt(U) is independent oft). Show that every solution curve is a closed set.

The graph below shows the line of best fit for data collected on the number of cell phones and cell phone cases sold at a local electronics store on twelve different days. number of cell phone cases sold 50 * 0 5 10 15 20 25 30 35 40 45 number of cell phones sold which of the following is the equation for the line of best fit? a. y = 0.8x b. y = 0.2x c. y=0.5x d. y = 0.25x