There are two goals in the game of soccer. : False True

Which one of the following research methods can show cause and effect

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?