How do you solve the equation 3 1/5 +n=9?

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

How many grams the dog will eat in 3 days?

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me