Question 79693
Volume of  Pyramid is given by:
{{{V=(1/3)Bh}}}
Where B = Base Area, and h = height
You are given V already, and you can figure out B, since the problem gives you the sides of the square base. The area of a square = s^2, which is 16cm^2 in this case. Substituting these values into the above equation gives you:
{{{80=(16/3)h}}}
{{{h=(80*3)/16}}}
{{{highlight(h=15)}}}