Seven to the negative 5th power is 0.00005949901
15 to the negative 5th power as a fraction can also be written as 1/15 to the 5th power.
1
1/-25
Negative 4 to the third power equals -64
.0001
0.000049
0.00032
0.000089
-0.00003
0.00032
10 to the negative 5th power (10-5) equals 0.00001