britneyemily7 britneyemily7

21-04-2020
Mathematics

contestada

Given ƒ(x) = 3x + 9, find x when ƒ(x) = 21.

A) 3
B) 4
C) 7
D) 10

Respuesta :

rsunil0001 rsunil0001

21-04-2020

Answer:

B

Step-by-step explanation:

Replacing f(x) with 21, this is the equation

21=3x+9

First, subtract 9 from each side of the equation to get:

12 = 3x

Next, divide each side by 3 to get:

4 = x

So the answer is B.

Answer Link

jessbean55 jessbean55

21-04-2020

x=21
21-9=12
3x=12
12divided by 3=4
X=4. The answer is B

Answer Link

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