There are 4 different french books and 4 different spanish books. how many ways are there to arrange them on a shelf if

(a) books of the same language must be grouped together, french on the left, spanish on the right?

(b) french and spanish books must alternate in the grouping, beginning with a french book?

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Of to(3, 4) (2,1) (3,7) (5,2) (5,-2) (3, 3) (-2, 3) (1,2) (-4,-2) (-3, 1) (4, -1) (-1, 1) 10 v 29