Please help me in this question

Step-by-step explanation:

8 can be written as 2³

so 8^-1 can be written as 2^-3

Solve for like terms

=> (2^-3)/(2^-4) = 2

=> 2×5³= 2×125 = 250

250 is your answer.

Hope this helps you.

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 !