Final answer:
To solve (8.42 x 10⁹) - (2.35 x 10⁸), convert 2.35 x 10⁸ to 0.235 x 10⁹, then subtract from 8.42 x 10⁹ to get 8.185 x 10⁹, which is option B.
Step-by-step explanation:
To calculate (8.42 x 10⁹) − (2.35 x 10⁸), we need to remember to align the exponents in scientific notation before performing the subtraction. For this problem, we’ll express 2.35 x 10⁸ with the same exponent as 8.42 x 10⁸ by converting it to 0.235 x 10⁹.
Now, subtract the two values: 8.42 x 10⁹ − 0.235 x 10⁹ which equals to 8.185 x 10⁹.
The final answer is formatted in proper scientific notation as B. 8.185 x 10⁹.