Question

1m = 100cm
1 billion km = 1,000,000,000 km
=1 x 10^9 km
= 1 x 10^9 x 100 cm
= 1 x 10^11 cm

Can you please explain to me in detail
I am a homeschool student, so really appreciate if you can help

Answer 1

It seems that you've made mistakes in conversation from kilometres to metres & centimetres...

$1km = 1000m \: or \: {10}^{3}m \\ = 100000cm \: or \: {10}^{5}cm$

&

$1 \: billion \: = {10}^{9}$

so,

$1 \: billion \: km = {10}^{9}km \\ = {10}^{9} \times {10}^{5} cm$

$= {10}^{9 + 5} \: cm \\ = {10}^{14} \: cm$

Answer 2

Step-by-step explanation:

1km = 1000m or  10³ m

= 100000cm or  10⁵ cm

&

1 billion  = 10⁹  

so,

1 billion km

=  10⁹ km

=  10⁹ x 10⁵ cm

=  10⁹⁺⁵ cm

=  10¹⁴ cm