Using a scientific calculator or graphing calculator find the inverse tangent of the ratio. Round to the nearest degree. 3/1

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression

Which one is true about the hexagons ?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.