Plz help I'll give brainliest.​

x=80°

Step-by-step explanation:

Straight line=180°

therefore,

180=2x-30+50

minus 50 on both sides

130=2x-30

plus 30 on both sides

160=2x

divide 2 on both sides

x=80

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:

i think asking google will you get the answer to that question