Hello, i need with all these problems. so, i would like someone can me

2.  

3. -0.28

4. a.

b.

Step-by-step explanation:

2. Given that  

⇒ or  

Since x belongs to [0,2π).

Therefore, (Answer)

3. Given that,  

⇒ Degrees  

{Since is in first quadrant}

So, (Answer)

4. a. Given

b. (Answer)

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: