What is the volume of the pyramid in cubic millimeters? A rectangular pyramid with a base of 21 millimeters by 18 millimeters and a height of 15 millimeters.

The volume of the pyramid in cubic millimeters is 1890 mm³

Step-by-step explanation:

To calculate the volume of a rectangular pyramid in cubic millimeters with a base  21 millimeters  by 18 millimeters and a height of 15 millimeters, we will follow the steps below:

First, write the formula for calculating the volume of a rectangular pyramid

v =

where v is the volume of the rectangular pyramid

l is the base length

w is the base width

and h is the pyramid height

From the question given

height h = 15 millimeters

l = 21 millimeters     and    w= 18 millimeters

we can now proceed to insert the values into the formula

v =

v = 21 × 18× 15  /3

v =

v = 1890 mm³

Therefore, the volume of the pyramid in cubic millimeters is 1890 mm³

i assume that by 5 you mean 5 gallons.

(20)(0.25) = 15

removing 15 gallons reduces the tank from 20 to 5.