If cosx= 5/13 and sinx < 0 find sin(x/2)

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 statements about these triangles is true

Solve 2x+y=3 x+y=5 in substitution method