Answer:
The answer is spread from 1 to 6! This is because the dots are spread through numbers 1-6 and there are no gaps.
so first day and so on
7, 10, 13,....
as you can see it's an arithmetic progression
so sum for nth term= n/2 { 2a + (n-1) d}
it's the sum of the 7th term
so
7/2 { 7 ×2 + ( 7-1) 3}
7/2 × 32
7× 16
112 fishes
Since

Is a perfect square, we can think of the "-6" at the end as a "+4-10" and we have

Which is the required form
Please give me brainlest
click this link.
https://artofproblemsolving.com/wiki/index.php/2019_AMC_8_Problems/Problem_24
or copy it then paste it in search.