Plz, me, guys! show a step by step if you can.
a local ace hardware sells batteries ($3) and small boxes of pens ($4). in august, total sales were $976. customers bought 4 times as many batteries as boxes of pens. how many of each did ace hardware sell?

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