Which of the following is a proportion? a.4/6 =8/12 b. 14/21 = 9/12 c. 5/7 =10/12 d.9/15 = 12/18

What number produces an irrational number when multiplied by -1.25

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

20 only answer if 100% sure most high school-aged teens are very active. a. true b. false