Which of the following is a geometric sequence?

0, 2, 6, 12, 72, . . .

1/2, 2/3, 3/4, 4/5, 5/6 . .

4, 9, 14, 19, 24, . . .

1, 3, 9, 27, 81, . . .

∠1 and ∠2 are complementary. ∠1=x°∠2=(3x+30)° select from the drop down menu to correctly answer the question. what is the value of x? . a.15 b.25 c.30 d.40 e.55

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.