weldontimmons weldontimmons
  • 22-10-2020
  • Mathematics
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what is 3x + 9 =21 when x =4

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zoeyangelee
zoeyangelee zoeyangelee
  • 22-10-2020

Answer:

21

Step-by-step explanation:

Original Equation:

3x + 9 = 21

x = 4

Plug the value into the equation.

3 ⋅ 4 = 12

12 + 9 = 21

21 is the answer.

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