Translate and solve the algebraic statement for the given number below:
"The difference of a number (n) and seven is equal to twice the number (n)."
n=14
n=7
n=-7
n=21

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

This is about circle theorems. someone asap : (

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?