The remaining mass of a radioactive iodine -151 is given by the formula M=Mo(2) -t/8 where M is the Remaining mass in grams Mo is the initial Mass in grams, and t is the time in days. How many days does it take for the 726 grams to be reduced to half.

Abox of chocolates costs $7. which equation relates the number of boxes sold (x) and total cost of the boxes sold (y)?

Aboard 60 in. long is cut two parts so that the longer piece is 5 times the shorter. what are the length of the two pieces?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.