Answer:
1) Option A - [tex]4.5\times 10^{-3}[/tex]
2) Option B - [tex]1.997\times 10^{2}[/tex]
Step-by-step explanation:
1) To find : Which number is written in scientific notation ?
Solution :
Scientific number is a way of writing very large or small numbers.
The notation is represented as one number before decimal times 10 to the powers.
From the options,
A) [tex]4.5\times 10^{-3}[/tex]
B) [tex]14.5\times 10^{2}[/tex]
C) [tex]0.78\times 10^{-6}[/tex]
D) [tex]5.7\times 4^{8}[/tex]
The correct way of writing number in scientific notation is [tex]4.5\times 10^{-3}[/tex]
Therefore, Option A is correct.
2) To find : Which number is greatest ?
Solution :
The greater is the power of 10 the greater is the number.
From the options,
A) [tex]2.89\times 10^{-8}[/tex]
B) [tex]1.997\times 10^{2}[/tex]
C) [tex]8.9\times 10^{-6}[/tex]
D) [tex]0.5\times 10^{-6}[/tex]
The greater power is 2 rest all are negative so [tex]1.997\times 10^{2}[/tex] is greatest number.
Therefore, Option B is correct.
