∠a=8x−8 ∘ start color #11accd, angle, a, equals, 8, x, minus, 8, degrees, end color #11accd \qquad \greend{\angle b=5x + 25^\circ}∠b=5x+25 ∘ start color #1fab54, angle, b, equals, 5, x, plus, 25, degrees, end color #1fab54

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11-1 > 1-1+a

-12 > a

my guess would be b and d, but i didn’t actually get out the pen and paper. lol

2

step-by-step explanation: