All 21 angles for brainliest and 50 points

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

The parabola x= √y-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.