Which of the following statements contain a variable

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

What is the volume of this container?

As voters exit the polls, you ask a representative random sample of voters if they voted for a proposition. if the true percentage of voters who vote for the proposition is 63%, what is the probability that, in your sample, exactly 5 do not voted for the proposition before 2 voted for the proposition? the probability is