Suppose you want to order greeting cards. a box of greeting cards cost $4.95. there is shipping and handling fee of $5.25 for the entire order. how many boxes of cards can you order if you want to spend no more than $30

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?