Can you help me with all of them? like just tell me the answer please

1. preform the indicated operation. then estimate to see whether the proposed result is reasonable. 811.1 - 8.039 803.071 803.061 803.161 831.061 2. the ordered pair (1, 2) lies in which quadrant? quadrant ii quadrant iv quadrant iii quadrant i 3. sean tries to drink 3 liters of water every day how my millimeters of water does he drink in a day? 0.3 ml 0.003 ml 3,000 ml 30 ml 4. find the least common multiple. (lcm). 10, 36 5 180 20 360

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18