Connor uses a rectangular shoe box to make a home for the centipedes he found outside. The
base of the shoe box is 30 in?. He adds soil to
the box until the level of the soil is 5 inches
tall. He then fills the rest of the box with dead
plants and leaves. The volume of the dead
plants and leaves he added was 90 in?. What is
the height of the section he filled with dead
plants and leaves?