Answer:
Step 3
Step-by-step explanation:
the first 2 steps were correct, but 10^9 times 10^-5 equals 10^4, not 10^14.
when multiplying numbers with the same base and different exponents, you add the exponents. 9 plus -5 equals 4. his mistake was leaving out the negative sign, giving his incorrect answer 9 + positive 5 = 14.
hope this helped!
