Which of the following readily passes through the glass walls and roof of a greenhouse? 1. longer-wavelength infrared radiation
2. shorter-wavelength infrared radiation
3.visible light waves

answer key:
( ) 1 only
( ) 1 and 2 only
( ) 2 and 3 only
( ) 1, 2, and 3

[content deleted] - user123802726recklesschicken

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

i think the answer is b.