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

step-by-step explanation:

irrational, then, just means all the numbers that aren't rational. every integer is a rational number, since each integer n can be written in the form n/1. however, numbers like 1/2, 45454737/2424242, and -3/7 are also rational, since they are fractions whose numerator and denominator are integers.

step-by-step explanation: