Answer:
A. 9 ft
Step-by-step explanation:
Given that volume of the pyramid = 90 cu. ft.
Given that area of the base of the pyramid = 30 sq. ft.
Now we need to find about what is the height of the pyramid.
So plug the given values into formula of the volume of the pyramid
[tex]volume=\frac{1}{3}\left(Base\ Area\right)\left(Height\right)[/tex]
[tex]90=\frac{1}{3}\left(30\right)\left(Height\right)[/tex]
[tex]90=\left(10\right)\left(Height\right)[/tex]
[tex]\frac{90}{10}=Height[/tex]
[tex]9=Height[/tex]
Hence correct choice is A. 9 ft
