Nine-year-old amanda has no problem understanding that the 20-year-old woman who sometimes stays with her is both a student and a babysitter. according to piaget, this is because amanda's thinking has moved beyond

the concrete oprational stage

Explanation: According to Piaget, this stage goes from approximately 7 yrs old to 11 yrs old and allows the child to overcome their egocentric thinking. This means that they can now understand reversibility of things, for example that a litre of water will be the same independently of the bottle or container; this also allows the child to be able to "put themselves in someone else's position".

This child in particular is now able to understand that her babysitter is also an student due to having acquire this ability.

experiments.

surveys.

questionnaires.

interviews.

case studies.

participant and non-participant observation.

observational trials.

studies using the delphi method.

i believe she will have 25 quarters.

step-by-step explanation: