An office supply store recently sold a black printer ink cartridge for $17.99 and a color printer ink cartridge for $20.99. At the start of a recent fall semester a total of 59 of these cartridges was sold for a total of $1115.41. How many of each type were purchased?

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