4. CONSTRUCTION Peyton is using a sledgehammer to drive fence posts into the ground.
4. CONSTRUCTION Peyton is using a sledgehammer to
drive fence posts into the ground. On his first swing, he
drives a post five inches into the ground. Since the soil is
denser the deeper he drives, on each swing after the
first, he can only drive the post 30% as far into the
ground as he did on the previous swing. How far has he
driven the post into the ground after five swings?