8 cm and 9 cm is the correct answer
Answer:

Step-by-step explanation:
√a^4 is the same as:
√a × √a × √a × √a
group them as 2 pairs of
(√a × √a) × (√a × √a)
which makes
a × a
which is the same as 
Answer:
4. The range of the function is all
real numbers less than or equal to 9.
Answer:
The last one.
Step-by-step explanation:
Answer:
Step-by-step explanation: