Answer:
Explicit formula: 
Step-by-step explanation:
Let the number of squares in
layer be 
Given:
Number of squares in first layer, 
Number of squares in second layer, 
Therefore, the number of squares increases by a factor of 2.
So, it follows a geometric sequence with the first term as 6 and common ratio of 2.
For a geometric sequence, the
term with common ratio
is given as:

Here, 
∴ Explicit formula: 
Idk if this is what you need but
Answer:
Length = 15m
Width = 5m
Step-by-step explanation:
w = 1/3l
p = 2l + 2/3l
40 = 2 2/3 l
l = 15
w = 1/3(15)
w = 5
If my answer is incorrect, pls correct me!
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-Chetan K