Mercury-197 has a half-life of about 64 hours. after 288 hours, about how many milligrams of a 750 mg sample will remain?
a. 643 mg
b. 167 mg
c. 33 mg
d. 17 mg

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

How far could you drive on 50 gallons of gas

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33