1.What the product of (5.1 x 10^3)x 
(3.2 x 10^3)?(Please express your answer in scientific notation) 
16.32 x 10^6 
1.632 x 10^7 
16.32 x 10^9 
1.632 x 10^10 

2.What is the product of (7.28 x 10^-2)x(9.1 x 10^-2)? (Please express your answer in scientific notation) 
6.6248 x 10^-3 
66.248 x 10^-4 
6.6248 x 10^4 
66.248 x 10^-3 

3.What is the quotient of (2.965 x 10^7) 
:(5x10^3)? :=divide 
14.825 x 10^4 
5.93 x 10^5 
14.825 10^5 
5.93 10^3