Checking account A charges a monthly service fee of $2 and a per-check fee of $0.30, while checking account B charges a monthly service fee of $3 and a
per-check fee of $0.20. How many checks would a person have to write for
the two accounts to cost the same?

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities