What is 28/49 in simplest form?

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

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.