Which property is illustrated? 11. 0 + a = a
12. -k + k = 0
13. 7 + (-8.3) = -8.3 + 7
14. (-2 + 8) + 5 = –2 + (8 + 5)

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 width of a rectangle is 20 units. can the perimeter p of the rectangle be 64 units when its length x is 11 units? no, because p = 2x + 2(20) no, because p ≠ 2x + 2(20) yes, because p ≠ 2x + 2(20) yes, because p = 2x + 2(20)

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?