2) which of these is a one-step equation?
A) x + 9 = 21
B) x = 11
C) 2x + 9 = 21

A

Step-by-step explanation:

Because the only step is to subtract 9 from both sides and then you get x=12

:)

there is no one step equation becuz

x+9 = 21

take 9 to the other side becos both are same variables then

21-9 = x

hence x= 12

next x=11 question can't be answered becuz this is not a complete question

2x+9 = 21

21-9 = 2x

12=2x

x=

12

2

hwnce 12/2 = 6 therefore x= 6

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:

75

step-by-step explanation: