I think it is the last one, have a nice day!
Firstly, subtract both sides by 4x:
Next, subtract both sides by 5:
Lastly, divide both sides by 2 and your answer will be
Answer:
523.6
Step-by-step explanation:
Following the calculation, and 3.14 for pi, the answer would be 523.6
If he rounded 5 to 5, 2 to 2 and 3 to 3 he did not estimate low or high.