The rule of 72 says that to find the number of years required to double your money at a given interest rate, you just divide the interest rate into 72.
The case of the extraneous variable is most likely to be determined by the student grade level that is level of the education program that is for the grade level. This refers to all the course level and can be use to trace out the external variable that are not intentionally studied in the test or experiment and tends to affect the other variables.
Yes it was justifiable 1. they needed food 2. they needed more cloth (clothing) sorry this is all i got for you hope this is at least a little helpful :)
