There are approximately 6.5 billion people on earth. if the average person has a mass of 65 kg, how much do all the people on earth weigh all together? a. about 41.4 trillion n b. about 42.5 trillion n c. about 65.2 trillion n d. about 74.0 trillion n

There is a typographical error in the list of choices, such that the correct answer is not among them.

Weight = (mass) x (gravity)

Gravity on Earth = 9.8 m/s²

Weight of ONE average person = (65 kg) x (9.8 m/s²) = 637 N.

Weight of all the people on Earth = (6.5 billion) x (637 N)

Weight of all = (6.5 x 10⁹) x (637 N)

Weight of all = 4,140.5 x 10⁹ N

Weight of all = 4.1405 x 10¹² N

"one trillion" means 10¹²

Weight of all = 4.1405 Trillion N .

Choice-A has the correct digits, but the decimal point is in the wrong place.  "41.4 trillion" is 10 times too big.

There was a typographical error, either when the book or homework sheet was getting ready to be printed, or else when Brennarfa copied the question into .  

If Jolly Old Hellhound showed us how he worked the problem, this strange glitch would jump right out for everyone to see.

So here's how it stands:

-- When they made up the test, they put the correct answer in 'A', and they put 'A' on the teacher's answer-key.

-- When the test got printed, 'A' got printed wrong.

-- Hellhound said 'A'.  That agreed with the answer-key, but we have no idea how he chose 'A' for the answer.

-- Brenna wrote Hellhound's choice on the test.  It agreed with the answer-key, and was marked correct.

-- Hellhound should have gotten the credit for that answer, but Brenna pretended like it was hers.

-- Brenna still doesn't know how to solve the problem, but loved the 100% on the test and doesn't care.

-- We all live happily ever after.

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length