Find the percent of decrease from 22 songs to 12 songs. Round to the nearest tenth of a percent if necessary. percent of decrease %

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

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

Asap! i need this done today and i really don’t understand it. some one ! will mark