Lisa walked x kilometers. Mary walked 2/7 less than that. Write an expression to represent how far Mary walked

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

What is the approximate value of  x  in the equation below.–3.396–0.7080.3040.955

Kelli swam upstream for some distance in a hour.she then swam downstream the same river for the same distance in only 6 minutes.if the river flows at 5km/hr, how fast can kelli swim in still water?