Mali noticed that the observed frequencies did not match the predicted frequencies what does she need to change in her experiment to get closer to the predicted values based on the theoretical probability for all the face cards

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

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Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply