Please awnser asap for 15

Given the sequence 7, 14, 28, 56, which expression shown would give the tenth term? a. 7^10 b. 7·2^10 c. 7·2^9

Combine like terms to make a simpler expression 3z+z

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be