It seems that the image you uploaded contains a math problem. I’ll help you solve it. Here's what I can make out from the image:

The problem asks to find the result of the following expression:

$6 \times 10^9 + 4 \times 10^9 : 8 \times 10^9$

The possible answers are:

a) $6 \times 10^{10}$ b) $6.5 \times 10^{10}$ c) $6.5 \times 10^{9}$ d) $18 \times 10^9$

Let’s break down the expression:

1. $6 \times 10^9 + 4 \times 10^9$ is the addition of two terms with the same power of 10: $(6 + 4) \times 10^9 = 10 \times 10^9 = 1 \times 10^{10}$

2. Now divide by $8 \times 10^9$: $\frac{1 \times 10^{10}}{8 \times 10^9} = \frac{1}{8} \times 10^{10 - 9} = \frac{1}{8} \times 10^1 = 1.25 \times 10^1 = 12.5$

So, the correct answer is not explicitly listed, but based on the closest option, none of the answers exactly match this result. However, there might be a mistake or simplification in the options. Could you confirm if there's any further context or clarification you might need?

Would you like a more detailed explanation or further help with other problems?

Follow-up Questions:

1. How do you handle adding and dividing terms with exponents?
2. What happens when you add terms with different exponents?
3. Can you simplify expressions like $10^{9} + 10^{8}$?
4. What other methods can you use to approach exponential division problems?
5. Can you rewrite the expression in scientific notation?

Tip:

When working with exponents, always make sure that the powers of 10 are the same before adding or subtracting, and adjust them for division to maintain consistency.