Final answer:
To subtract two numbers in scientific notation, subtract the digit terms and keep the same exponent.
Step-by-step explanation:
To subtract two numbers in scientific notation, you can simply subtract the digit terms and keep the same exponent.
In this case, we have (9 x 1010) - (4 x 1010). Subtracting the digit terms, we get (9 - 4) x 1010 = 5 x 1010.
Therefore, the difference between (9 x 1010) and (4 x 1010) is 5 x 1010.