A grocery store finds that the number of boxes of a new cereal sold increases each week. in the 1st week, 26 boxes were sold. in the 2nd week, 58 boxes were sold. in the 3rd week 90 boxes were sold. the number of boxes of cereal sold each week represents an arthimitic sequence.
A) State the explict rule for the arthimitic sequence that defines the number of boxes of cereal sold in week n.
B) Use this rule to calculate how many boxes of cereal will be sold in the 9th week.