321 + 321 = 642
321 + 432 = 753
321
Well, darling, 555 plus 321 equals 876. It's simple math, honey, nothing to lose sleep over. Go ahead and impress your friends with your newfound knowledge of addition.
Without an equality sign the given expression is not an equation but if you mean -6x = 321 then the value of x works out as -53.5 which is the solution to the equation.
160.5
321 + 321 = 642
321 is an integer, so the closest integer would be 321. (If 321 itself doesn't count, 322 and 320 are the same distance from it, and are the next closest.)
To round off 321 to the nearest 10, you would first identify the digit in the tens place, which is 2. Since the digit in the ones place is less than 5, you would round down to the nearest 10. Therefore, 321 rounded to the nearest 10 is 320.
-182 + 321 = 139
200 + 175 + 286 + 304 + 321 = 1,286
Each of these numbers will go evenly into 231: 1, 3, 7, 11, 21, 33, 77, 231.
321 + 432 = 753
123 + 321 = 444
Episode 321, I presume.
If you are rounding to the nearest tens, 320 is the answer. If you are rounding up to the nearest tens, 330 would be the answer. The difference is the word "up", which specifies that the answer will be greater than 321. The answer of 320 would be rounding down.
Most likely it's a Mossberg 321-320