1) which of the following arithmetic sequences have a common difference of 2 1/2? a) -4,-1.5,1,3.5,6,8.5 b) 2 1/2, 4 1/2, 6 1/2, 8 1/2, 10 1/2 c) 1.5,3,4.5,6,7.5 d) -5, -3 1/2, -1 1/2, 2 2) in this arithmetic sequence, what is the common difference? 11, 8, 5, 2, 3 -3 5 -1

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

(01.04 lc)multiply 1 over 6 multiplied by negative 1 over 2. negative 1 over 3 negative 1 over 12 1 over 12 1 over 3

Type the correct answer in each box. use numerals instead of words. the average number of subscribers to an online magazine each year from 2010 to 2015 is given in the table below. the average number of subscribers to the online magazine in 2010 was the percent increase in the average number of subscribers in 2011 to the average number of subscribers in 2012 was %. the maximum average number of subscribers to the online magazine in the years shown was