Jin bought 4 markers for $7. How many markers can he buy for $21? (label your answer for full credit)

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

What is the benefit of converting measures in a ratio to the same unit

Betty correctly answers 30 questions on your math test there are 40 questions on the test what percent of the questions did she answered incorrectly