Is this a function, why or why not

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

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28