19. Three students start jogging together on a circular track. If they respectively take 6 minutes , 8 minutes and 12 minutes to complete one round , when will they
meet again ?

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Determine which postulate or theorem can be used to prove that lmn =nmo