The Ashland High School Science Department is purchasing new earth science and physics textbooks this year. Ms. Eaton has requested 97 earth science textbooks and 71 physics textbooks for all of her classes, which costs the department a total of $7,624. Mr. Newman has asked for 95 earth science textbooks and 93 physics textbooks, which will cost a total of $8,640. How much do the textbooks cost?

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