Beginning in the middle of summer, the average temperature for a certain year in Phoenix could approximately be modeled by the function f(x)=26cos(0.0055πx)+89, where x represents the number of days since the middle of the summer, and f(x) represents the average temperature in degrees Fahrenheit. What was the lowest average temperature in Phoenix that year (approximately)?

a) 63∘F

b) 55∘F

c) 26∘F

d) 89∘F

Consider the diagram. which line segment has the same measure as st? rx tx sr xs

New york is the 27th largest state in the united states.what percent of the 50 states in the us are larger than new york

Researchers are conducting experiments to determine the role of alcohol in the development of depression. after the study is complete, they determine that the relative risk of developing depression is 1.55 with a 95 % ci of 1.2 -1.9. each group is then divided into nonsmokers and smokers. the relative risk for the nonsmokers is 1.12 with a 95% ci of 0.87-1.37. the relative risk for the smokers is 1.7 with a 95 % cl of 1.5-1.9. what type of bias may affect this study? a. procedure bias b. recall bias c. selection bias d. confounding e. lead-time bias