One billionth.
0.000000001
10-9 = 1/109 = 0.000000001
9 to negative 2 = 1/9 to plus 2 = 1/81
91
1 over 3 to the negative 2nd power is 9
1 everything to the power of 0 = 1
10-9 = 1/109 = 0.000000001
10-9 = 1/109 = 0.000000001
9 times 10 to the power negative 1
1/9
The sum of -9 and -1 is -10.
-9
9^(-2) = 1 /9^(2) = 1 / 81 = 0.01234567901...... recurring to infinity.
When you add -9 and +10, you get (+) 1.
9 to negative 2 = 1/9 to plus 2 = 1/81
19
91
1