0
9 x 10-4 = .0009
A negative exponent in scientific notation means you need to move the decimal to the left that many times.
Step by Step, one decimal at a time.
9 x 10-4 = 0.9x 10-3
0.9 x 10-3= 0.09x 10-2
0.09 x 10-2= 0.009x 10-1
0.009 x 10-1= 0.0009 x 100 (remember, 100 = 1)
0.0009 x 100 =0.0009 x 1 = 0.0009
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