Question

Which number is written in scientific notation? 6x10^11 12x10^-8 0.2x10^5 8x7^2

Answer 1

Answer: $6\times10^{11}$

Step-by-step explanation:

We know that the scientific notation is a technique to write a very large or a very small number in the product of a decimal form of  number [generally between 1 and 10]and powers of ten.

$6\times10^{11}\\\text{ It is in scientific form}\\\\12\times10^{-8}\\\text{It is not in scientific form, since} 12 >9\\\\0.2\times10^5\\\text{It is not in scientific form, since }0.2$

Hence, the number written in scientific notation is $6\times10^{11}$

Answer 2

For this case, the first thing you should know is that a number in scientific notation is a number of the form:
 $a * 10 ^ b$
 Where,
 a: is a number between 1 and 10
 b: is the exponent of the scientific notation.
 We have then that the number that is in scientific notation written correctly is:
 $6x10 ^ {11}$
 Answer:
 $6x10 ^ {11}$