(4.5x10^6)+(6.4x10^5)

5,140,000

Yup 5,140,000

or, to keep in scientific notation,

5.14x10^6

but if being strict about significant figures you only have two

5.1 * 10^6

To find the sum of (4.5 x 10^6) and (6.4 x 10^5), you first need to understand scientific notation. In scientific notation, a number is expressed as the product of a coefficient (a decimal number between 1 and 10) and a power of 10.

In this case, you have (4.5 x 10^6) and (6.4 x 10^5). To add these numbers, you need to ensure that their exponents (powers of 10) are the same.

First, let's rewrite (4.5 x 10^6) in standard notation:

4.5 x 10^6 = 4.5 multiplied by 10 raised to the power of 6, which gives you 4,500,000.

Now let's rewrite (6.4 x 10^5) in standard notation:

6.4 x 10^5 = 6.4 multiplied by 10 raised to the power of 5, which gives you 640,000.

Now that both numbers are in standard notation, you can simply add them:

4,500,000 + 640,000 = 5,140,000.

Therefore, the sum of (4.5 x 10^6) and (6.4 x 10^5) is 5,140,000.