Answer:
Step-by-step explanation: The correct simplification of the expression (4 x 10-6) X 3,000 can be found by multiplying the numerical coefficients and adding the exponents of 10.
4 x 10-6 is equal to 0.000004 in decimal notation.
Multiplying this by 3,000 gives:
(4 x 10-6) X 3,000 = 0.000004 x 3,000 = 12
Therefore, the simplified expression is 12.
Among the given steps, Step 2 is incorrect as it has incorrectly swapped the order of multiplication of the numerical coefficients and the exponents of 10.
Step 2: (4 x 3)(10-6 x 10³)
The correct order of multiplication should be:
Step 2 (Corrected): (4 x 3) x (10-6 x 10³)
This simplifies to:
Step 3: 12 x 10-3
And the final simplified expression is:
Step 4: 1.2 x 10-2
Therefore, the error in Jackie's simplification is in Step 2.