What determines the length of a year for a planet

What is the length x of the side of the triangle below? (hint: use the cosine function)

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?

The sound level near a noisy air conditioner is 70 db. if two such units operate side by side, the sound level near the, would bea. 70dbb. 73 dbc. 105 dbd 140 db