2. which comparison is true?\na $9.1 > 9.11$\nb $8.09 > 8.9$\nc $6.23 < 6.3$\nd $3.5 < 3.05$

Explanation:

Step1: Analyze Option A

$9.1 = 9.10$, so $9.10 < 9.11$. This comparison is false.

Step2: Analyze Option B

$8.09$ has a tenths place digit of 0, $8.9$ has a tenths place digit of 9. So $8.09 < 8.9$. This comparison is false.

Step3: Analyze Option C

$6.3 = 6.30$, so $6.23 < 6.30$. This comparison is true.

Step4: Analyze Option D

$3.5$ has a tenths place digit of 5, $3.05$ has a tenths place digit of 0. So $3.5 > 3.05$. This comparison is false.

Answer:

C. $6.23 < 6.3$