Lines a and b are parallel Line c is perpendicular to both line a and line 6. Which
statement about lines a, b, and c is NOT true?

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.)

The system of equations graphed below has how many solutions?

Which of the following is a proper fraction? a. 9⁄8 b. 5⁄6 c. 7⁄3 d. 4⁄2