What is the volume of this square pyramid? 48 cm³ 96 cm³ 144 cm³ 288 cm³.

The answer is oh i forgot 

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.

What are the options or answer choices.