What is 2.9 billion km - 206 million km in scientific notation?

Answer 1

2.9 billion km is equivalent to 2.9 x 10^9 km.
206 million km is equivalent to 206 x 10^6 km.

Subtracting these two values, we get:
(2.9 x 10^9 km) - (206 x 10^6 km)

To subtract these values, we need to make the exponents the same. In this case, both values are already in the same power of 10, which is 10^6.

So the difference in scientific notation is:
(2.9 x 10^9 km) - (206 x 10^6 km) = (2.9 - 0.206) x 10^9 km = 2.694 x 10^9 km.