Answer:
Options A and B
i.e., A. 4(3
) and B. 
Step-by-step explanation:
Like radicals are similar to like terms.
For example,
x, 2x, -10x,
, 7.3x are like terms.
are some more examples of like terms.
Similarly, like radicals are:
etc.
Hence, from the given options, like radicals to
are:
A.
and B. 
Answer:
A
Step-by-step explanation:
B, C and D are all equations.
A is the only one that is not.
The answer is A.
Answer:
postcodes
Step-by-step explanation:
Think of the post code as a combination lock
[?] [?] [?] [?] [?] [?]
If letters a numbers are allowed, each character can be A-Z and 0-9.
There are 26 letters, and 10 different digits
26 + 10 = 36 characters
Each block (I illustrated above) can be any of the 36 characters
If you have 2 blocks, you have a combination of
36 x 36 characters — which is the same as 
With 3 blocks: 
and so forth...
If your post code is made of 6 'blocks' it can be any combination of
