If a light bulb manufacturing company wants to estimate, with % confidence, the mean life of compact fluorescent light bulbs to within hours and also assumes that the population standard deviation is hours, how many compact fluorescent light bulbs need to be selected?.

Which statements about the two fossil images are correct? 1. cave bears are ancestors of plateosaurus. 2. plateosaurus were present on earth before ostracoderms. 3. ostracoderms were the first to die. 4. plateosaurus died after the ostracoderms. 5. cave bears are the oldest fossils.

In 1999, the u.s. announced trade sanctions worth $116.8 million, targeting goods from france, germany, italy and denmark. the sanctions were in retaliation for a ban on u.s. hormone-treated beef by which organization?

How was the sat? what type of questions for math, writing and reading. did anyone get a near perfect score and if so how long did it take to study. i am very stressed and want to get at least a 1450.