Answer: -40
Explanation: Percent error is calculated by subtracting the value you actually recieved from the literature value (175 in your case) SO your answer should be 135-175=-40.
Affordability and climate
Answer:
The answer should be Sodium chloride
25 m/s I believe because you are looking for t and if you changed the formula to t=s(d) or just keep the formula how it is and multiply to cancel out d you would be left with 5(5) so 25m/s