A. 6.9 B. 7.6 C. 7.1 D. none Right Answer: 7.6 Share : February 19, 2018 Asghar Khan Everyday Science Total 0 Votes: 0 0 Tell us how can we improve this Mcqs? Captcha: + = Verify Human or Spambot ? Related Mcqs Check Below -Acid rain is mainly caused by emissions of __________ in the atmosphere?A device which converts chemical energy into electrical energy is called?Human population growth is greatest in developing countries because ?