I added 6 to a certain number and then divide the result by 3. Find the number if my final answer is 5. (show working)

let the number be x

so (x+6)/3 =5

x+6=15

x=9

all eukaryotic cell have mitochondria : )

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.