Answer: 20 units
The volume of a rectangular pyramid is solved by:
[tex]V=\frac{lwh}{3}[/tex]
Where:
l = length
w = width
h = height
From the given, we know that:
V = 1200 units³
l = 20
w = 9
h = x
Substitute these to the formula and solve for x:
[tex]\begin{gathered} V=\frac{lwh}{3} \\ 1200=\frac{(20)(9)x}{3} \\ 1200=\frac{180x}{3} \\ 3(1200)=180x \\ 3600=180x \\ x=20 \end{gathered}[/tex]
Therefore, the value of x is 20 units
