Iodine-125 has a half-life of about 60 days. how many milligrams of a 1000mg sample will remain after 240 days?

Which of the following properties can be used to show

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?