Question
Ken received $1 from his father in the 1st week of school and $5 in the 2nd week. Each week, he receives $4 more than the week before.
  1. How much money did he received in the 20th week?
  2. In which week did he receive $21?
4 m
(a)

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(b)

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Ken received $1 from his father in the 1st week of school and $5 in the 2nd week. Each week, he receives $4 more than the week before.
  1. How much money did he received in the 20th week?
  2. In which week did he receive $21?