To test the quality of its books, a printing press randomly picks a book from its press and then selects every twentieth book off the press for a half hour. Which sampling method is used?

A. lottery method

B. random number table

C. stratified random sampling

D. systematic random sampling

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.