Jamal records the number of minutes he practice his trumpet each day what is the mean (average) number of minutes two more practice for the week shown in the chart below Sun. Mon. Tues. Wed Thur. Fri. Sat
20 15. 20. 45. 20 30. 25

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z