Answer:

Step-by-step explanation:
Answer: 9cm
Step-by-step explanation:
Answer:
Choice (3)
is correct.
Step-by-step explanation:
Given expression is 
Now we need to simplify this and check which of the given choices best match with it.


{using formula
}
{using formula
}


{using formula
}
Hence choice (3)
is correct.
Answer:
true
Step-by-step explanation:
because it is all correct
45555555555555555555555555