Vincent has been collecting 13 rocks per week. he gives 7 rocks away to a friend. if w represents the number of weeks that vincent has been collecting rocks, which expression represents the number of rocks vincent has left?

When you dilate a figure with a scale factor of 1/2, what will the dilated figure look like?                                                                                           a: the dilated figure will have side lengths that are half the length of the original side lengths.                                                                          b: the angles in the dilated figure will be half the measure of the original figure.                                                                                c: the dilated figure will have side lengths twice the length of the original.