Answer:
<h2>

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Step-by-step explanation:
Steps:

Subtract 4 from both sides:

Simplify:

Divide both sides by 12:

Simplify:

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
Make 3 2/9 improper fraction
3 2/9 = 29/9
29/9 * 3/5 = 87/45 = 29/15
The answer is 29/15
For what- there’s no pic sorry