Review Mara's work in steps 3 and 4. (Hint: There is one mistake in those steps.) a. Be sure to explain what she did and why it was correct or incorrect for Step 3.

b. Be sure to explain what she did and why it was correct or incorrect for Step 4.

c. Provide Mara with feedback on what the mistake was and how to fix it.

a) Step 3 is correct. You can apply the log to both sides, as long as the log base is the same.

b) Step 4 is incorrect. The expression should simplify to 3, and not 9. This is because 3^3 = 27. Recall that is equivalent to

So the final answer should be x = 3

If we check this with the original equation, then we have

7*3^x = 189

7*3^3 = 189

7*27 = 189

189 = 189

So the answer is confirmed.

is there answer choices?