Question

Divide (8.6 x 108) by (3.2 x 103). Express your answer in scientific notation.
A) 26875 x 10^6
B) 2.6875 x 10^5
C) 2.6875 x 10^11
D) 26.875 x 10^24

Answer 1

I believe the given should be written as,
                         (8.6 x 10^8) ÷ (3.2 x 10^3)
By directly solving the expression, we obtain an answer of 
                                       268750
Which can also be written as 2.6875 x 10^5. Thus, the answer to this item is letter B. 

Answer 2

Answer: $2.6875\times10^{5}$

Step-by-step explanation:

Given expression : $(8.6\times10^8)\div(3.2\times10^3)$

The division law of exponent says that $a^m\div a^n=a^{m-n}$

Therefore,

$(8.6\times10^8)\div(3.2\times10^3)\\\\=\frac{(8.6\times10^8)}{(3.2\times10^3)}\\\\=2.6875\times10^{8-3}................\text{by law of exponent}\\\=2.6875\times10^{5}$