Answer:
1/7^7
Step-by-step explanation:
Exponents are simply repeated multiplication.
Here, 1/7 is multiplied by itself 7 times.
Therefore, the exponent is 1/7^7.
The two angles together form a straight angle, i.e. an angle of 180 degrees. This means that

Sum like terms:

Subtract 27 from both sides:

Divide both sides by 9:

I believe that the question is assuming this is taking place over one month here is what I think you would do.
1) 75/12.5 = 6
2) add that answer to 75, so 75+6, and you get 81