It is: 80+2 = 82
The sum of the first ( n ) positive integers can be calculated using the formula ( \frac{n(n + 1)}{2} ). For the first 80 positive integers, this becomes ( \frac{80(80 + 1)}{2} = \frac{80 \times 81}{2} = 3240 ). Therefore, the sum of the first 80 positive integers is 3240.
It is 80*81/2 = 3240
36 and 44 80/2 - 8/2 and 80/2 + 8/2
Sum = 140 Count = 2 Average = Sum/Count = 140/2 = 70
37 + 43 = 80 2 + 3 + 5 + 23 + 47 = 80 2 + 7 + 11 + 17 + 43 = 80
The sum of -80 and 77 is -3
33 and 47
The average is the sum of the elements divided by the number of elements In other words, 80%+82.54% then divide the sum by 2.
2 meters is 200 centimeters, so... 80 + 90 = 170 centimeters 30 centimeters longer
The sum is -80.
172 cm
Sum = 79*(79+1)/2 = 79*80/2 = 3160