9.3333
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As a whole number it is 14
- 3a - 1 = - 15 add 1 to each side - 3a = - 14 divide each side by - 3 ( dividing a negative by a negative leaves a positive #) a = 14/3 check - 3(14/3) - 1 = - 15 - 15 = - 15
Add all of the numbers, and divide the result by how many numbers there are.21 + 17 + 14 + 28 + 15 = 9595 / 5 = 19
It is the same as divide by 98*15 that is, divide by 1470
3, looks as if you add 9 to the first number, then add 1, divide by 5, add 9, add 1, divide by 5 to get 3