Answer:
4.4975 × 10⁷ mm/s
Step-by-step explanation:
If we write each of these in standard form:
[tex]4.5\times10^7=45,000,000[/tex] mm/s
[tex]2.5\times10^4=25,000[/tex] mms/s
Now, subtracting the two, we find the difference is
45,000,000 - 25,000 = 44,975,000 mm/s
To express this in index form, we first need to move the decimal on 44,975,000 until it's a number between 1 and 10. Moving it 7 decimals to the left works for this, giving us the number 4.4975. The last piece is adding the index: to get back to 44,975,000, we need to move the decimal on 4.4975 seven places to the right, which is the same as multiplying it by 10⁷. So in index form, our difference is 4.4975 × 10⁷ mm/s
