Question

Which number is written in scientific notation

A.4.5*10^-3
B.14.5*10^2
C.0.78*10^-6
D.5.7*4^8
which number is greatest
A.2.89*10^-8
B.1.997*10^2
C.8.9*10^-6
D.5*10^-6

PLease help

Answer 1

A and B.
____________

Answer 2

1) Option A -
`4.5* 10^(-3)`

2) Option B -
`1.997* 10^(2)`

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)
`4.5* 10^(-3)`

B)
`14.5* 10^(2)`

C)
`0.78* 10^(-6)`

D)
`5.7* 4^(8)`

The correct way of writing number in scientific notation is
`4.5* 10^(-3)`

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)
`2.89* 10^(-8)`

B)
`1.997* 10^(2)`

C)
`8.9* 10^(-6)`

D)
`0.5* 10^(-6)`

The greater power is 2 rest all are negative so
`1.997* 10^(2)` is greatest number.

Therefore, Option B is correct.