which expression is equivalent to (the pic has the full question and answer choices)

Answer:
3*10^(-5)
Step-by-step explanation:
In the expression above, the powers of 10 can be simplified
3.6*10^7/(7.5*10^6)(1.6*10^5)
3.6*10^(7-6-5)/(7.5)(1.6)
3.6*10^(-4)/(12)
0.3*10^(-4)
Times it by 10 than reduce the power by 1:
3*10^(-5)