10 p You do not need a calculator to find the exact value of
cos? (385°) + sin?(-25°). Find this value without the aid of a calculator
and explain how you did it so that a classmate would understand and be
able to reproduce your work.

Find the area of the regular hexagon if a side is 20 cm.

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 area of the regular 24-gon with radius 5 mm