Question

15 Points for grade 7 Math！！！！！！！！！！！！！！！！！！！！！！1

Answer 1

Answer:

$8\cdot 10^{700}$

Step-by-step explanation:

Since multiplication is commutative, you can rearrange this expression to simplify it.

$(4.5\cdot10^{400})(2.0\cdot10^{300}) = (4.5\cdot2.0)\cdot(10^{400}\cdot10^{300})=\boxed{8\cdot 10^{700}}$. Hope this helps, and comment below with more questions if this didn't make sense!