Bob has 20 feet of fencing to enclose a rectangle garden. if one side of the garden is x feet long , he wants the other side to be (10-x) feet wide. what is the value of x will give the largest area, in square feet, for the garden?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?