How much of a radioactive kind of actinium will be left after 12 hours if the half-life is 6 hours and you start with 384 grams?

Can someone me with the property questions for 12 13 and 14 plz

Benjamin is making bow ties. how many 1/2yards lomg bow ties can he make if he has 18 feet of fabric?

Use your knowledge of the binary number system to write each binary number as a decimal number. a) 1001 base 2= base 10 b) 1101 base 2 = base 10