1 . 9x+9x+9x=

• A. $9^{3x}$
• B. $3^{2x+1}$
• C. ${27}^x$
• D. $3x^3$

Answer: Option B

Explanation:

2 .

• A. ${27}^x$
• B. $3^{2x+1}$
• C. $9^{3x}$
• D. $3^{x3}$

Answer: Option B

Explanation: