shirley is a member of a DVD club. she bought 4 used DVDs for $21. She wants to buy a…

shirley is a member of a DVD club. she bought 4 used DVDs for $21. She wants to buy a…

shirley is a member of a DVD club. she bought 4 used DVDs for $21. She wants to buy a total of 10. how much will 10 DVDs cost her?