Mr. chan buys a roll of paper towel for $2.19 a bottle of window cleaner for $2.69. in this state there is a 4 percent sale tax on these items. mr. chan also buys a gallon of milk for $3.95. there is no sales tax on milk. mr. chan has a $5 coupon to usr at the store.

b1) write a number sentence to find mr. chan's total bill. what is his total bill?

b2) is there more than one way to compute this total?

b3) explain how you know which operation(s) to use.

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect