Acontractor uses the expression
7(x +3) to find the length in feet of chain that he needs for a certain project.

the contractor needs four chains that are the this length what is the total length of all of the chains

part b the contractor needs another chain that is 50% longer than the first chain write an expression he can use to find the length of this chain explain how you know your expression is correct

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