Linda used 3 2/3 gallons of gas on Friday and 2 3/5 gallons of gas on Saturday. How many more gallons of gas did she use on Friday?

Explanation:

First:

we can start off by turning the fractions into decimals

so 2/3=0.66

and 3/5=0.60

and we add the whole number

 3.66

- 2.60

which leaves you with 1.06

all that's left is turning it into a fraction

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.