One root of Rx) - XP-4x2 -20+48 is x = 6. What are all the factors of the function? Use the Remainder Theorem. 0 (x + 6)(X + 8)
(x-6)(x-8)
(x-2)(x + 4)(x-6)
(x + 2)(x-4)(x+6)

what i would say the best answer is a. 40.5

12r - 8 - 12

you have to combine like terms. below i have bolded the like terms:

12r - 8 - 12

together it combines to:

12r - 20

hope this !

we would need a picture of the quadrilateral in order to answer the question. also, it seems that the question is missing some components.