Find the value of y for the given value of x y= x/3 ;x=12

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

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.

Acircle has a circumference of 28.36 units what is the diameter of the circle