7.7x10^-4 -4.9x10^-5

Answer 1

To subtract the two numbers, we first need to express them with the same exponent.

The numbers are:

1. \( 7.7 \times 10^{-4} \)
2. \( 4.9 \times 10^{-5} \)

To make the exponents the same, we can convert \( 4.9 \times 10^{-5} \) to the same exponent as \( 7.7 \times 10^{-4} \).

We can rewrite \( 4.9 \times 10^{-5} \) as follows:

\[ 4.9 \times 10^{-5} = 0.049 \times 10^{-4} \]

Now we can perform the subtraction:

\[ 7.7 \times 10^{-4} - 0.049 \times 10^{-4} = (7.7 - 0.049) \times 10^{-4} \]

Calculate \( 7.7 - 0.049 \):

\[ 7.7 - 0.049 = 7.651 \]

So, we have:

\[ 7.7 \times 10^{-4} - 4.9 \times 10^{-5} = 7.651 \times 10^{-4} \]

Thus, the result is:

\[ \boxed{7.651 \times 10^{-4}} \]