A polygon contains an angle that measures 145 ∘ and an angle that measures 210 ∘ 210∘. It has at least one other angle. Which of the following could be the name of that polygon? A Concave hexagon. B Convex octagon. C Concave dodecagon. D Concave Pentagon.

b) 36

step-by-step explanation:

18 times 2 is 36

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:

step-by-step explanation:

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1 1/5

step-by-step explanation: