Amy and stephanie were playing a number game. amy picked a number and told stephanie that if she added 9 to the number and multiplied the sum by 3, it would equal 12. which equation could stephanie use to find the number, x?

3(x+9) = 12

Step-by-step explanation:

you can set up the equation as 3(x+9) = 12, since sum of x+9 multiply by 3 will equal 12, therefore you have that equation.

To solve for x:

3(x+9) = 12

x+9 = 4

x = -5

the answer is the third / last answer

step-by-step explanation: