Scientific notation, just check and confirm with me!! please?

Question

(5 x 10^-5) x (11 x 10^4) =

scientific: 5.5 x 10^0

decimal: 5.5

0.06457 =

scientific: 6.457 x 10^-2

(1.32 x 10^-3 + 3.44 x 10^-4)

same exponent:

(13.2 x 10^-4) + (3.44 x 10^-4)

final answer:

.001664

Ya.?

Answer 1

1)

(5 x 10^-5) x (11 x 10^4)

= (5 x 11)(10^-5 x 10^4)

= 55[10^(-5 + 4)]

= 55[10^-1]

= 55 x 10^-1

= 5.5 x 10^(-1 + 1)

= 5.5 x 10^0

2)

0.06457

= 6.457 x 0.01

= 6.457 x 1/10^2

= 6.457 x 10^-2

3)

(13.2 x 10^-4) + (3.44 x 10^-4)

= 10^-4(13.2 + 3.44)

= (1/10000)(16.64)

= 16.64/10000

= 0.001664

Answer 2

The answers are right

You forgot the scientific notation of the 3rd one :

1.664 x 10^-3