Me in this select all names that apply to the number. what is the value of x if x2 = 36/81? a) 2/3 b) 4/9 c) ± 2/3 d) ± 4/9

Hello from MrBillDoesMath!

   C)

Discussion:

To solve x^2 = 36/81  take the square root of both sides.

x = square root of (36/81)

As 36 = 6*6 and 81 = 9*9,

x = square root of (6*6)/ (9.9) or 6/9  

But 6 and 9 share the common factor "3" so

x =  6/9 = (2*3)/(3*3) = 2/3              

The last equality was gotten by cancelling the common factor 3.

Regards, MrB

other answer is correct. i had used the radius of the radius somehow. a website: