Chapter 5 Polynomials and Polynomial Functions - 5.1 Use Properties of Exponents - 5.1 Exercises - Skill Practice - Page 333: 15

$$ 6.3\times 10^9$$

We know that scientific notation is: $a*10^b$, where $a$ must be between 1 and 10. Thus, we first multiply the two numerical values and the two values raised to a power. If the value of $a$ is between 1 and 10, we are done. If it is not, we must change the value of $b$ such that the value of $a$ is between 1 and 10. Doing this, we find: $$6.3\times 10^{3+6} \\ 6.3\times 10^9$$