Answer:
2. 4π
3. between 5 and 6
Explanation:
2. both
and
is smaller than 10, because 10 itself is

when you rounded π, it closest value is 3.14 or 22/7, so 0.5 π < 10
so 4π is the answer.
3. √26 is close to 5, but greater than 5 also, so it's not possible if √26 is to the left of 5, it must be between 5 and 6