Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Write a mathematical expression for the quantity described verbally.
-A number $x$ decreased by six and then doubled

A) $2 x - 6$
B) $x - 26$
C) $2 ( x + 6 )$
D) $2 ( x - 6 )$