How many solutions? 3x+9=21

A.
One solution

B.
No solutions

C.
Infinite solution

One solution

Step-by-step explanation:

3x+ 9 = 21

        3x = 21- 9

       3x = 12

         x = 12/3

x = 4

So, one solution

A. one solution

Step-by-step explanation:

solve for X and the only possible answer would be 4 , so A

me! what did you put for this question?

step-by-step explanation:

statement #3: proof- ang is congruent to ang ecd : angles are congruent.  

step-by-step explanation:

1: the missing angles in statement #3  

a.) acb  

reason- the reason why the answer is acb is because angle ecd and angle acb are both the same size *that's what the word congruent means this is really simple.  

2: the missing word in reason #3  

c.) vertical  

reason- the reason why the answer is vertical is because the angles in that diagram on figure 2 is slanted, which is vertical, and the e and a both lay on vertical lines. along with the other's, but e and a are the 2 main points you want to focus on. and c is kind of like your starting point, because c is for both angles, not just one.  

i hope that was and understanding.