Question

Find the difference. Write your answer in scientific notation.
(7.8×10^7)−(2.45×10^6)

Answer 1

To find the difference between the two numbers in scientific notation, we need to first make sure that the exponents are the same. We can do this by rewriting 2.45×10^6 as 0.245×10^7. Then we can subtract the two numbers:

(7.8×10^7)−(2.45×10^6) = (7.8×10^7)−(0.245×10^7)

= (7.8−0.245)×10^7

= 7.555×10^7

Therefore, the difference between these two numbers in scientific notation is 7.555×10^7.

Answer 2

7.555×10^7.

Explanation:

We need to make sure that they have the same exponent. We can do this by adjusting the decimal point in the first number to subtract:

(7.8×10^7)−(2.45×10^6)

(7.8×10^7)−(0.245×10^7) (since 2.45 = 0.245*10)

Now, we can subtract the two numbers by taking common:

10^7*(7.8-0.245)

7.555*10^7

Therefore, the difference between the two numbers in scientific notation is 7.555×10^7.