In a cookie jar,

1

4

of the cookies are chocolate chip and

1

3

of the rest are peanut butter. what fraction of all the cookies is peanut butter?

The half-life of a certain material is 0.002 second. approximately how much of a 14-gram sample will be left after 0.004 second? a. 12 grams b. 3.5 grams c. 0.06 gram d. 7 grams