Hello,
So with this problem, you must know the formula to figure it out.
The formula for a pyramid is: lwh/3 This merely stands for: length× width× height÷3
So for this rectangular pyramid, these are the measurements:
Length: 5 feet
Width: 9 feet
Height: 7 feet
So, we now insert the measurements into the formula.
5× 9× 7/3
Next, we multiply...
5×9×7= 315
Then, we divide...
315÷ 3= 105
Finally we have to add a label which would be "feet".
Answer: B) 105 ft3
