Ill give branliest if corect and on time wich is now. A rectangular painting is 42 centimeters wide and 51 centimeters long.

What is the perimeter of this painting?

next one

A rectangle is 34 yards long and 6 yards long.

What is the area of this rectangle?

80 yd²

104 yd²

184 yd²

204 yd²

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