On July 5*2019, two earthquakes struck Trona, California. The largest one was 7.1 on the Richter Scale. It took 123.6 sec for this earthquake to be felt in Long Beach, 192 miles away. (1mile = 1609.3meters).
a) What was the velocity (v) of the earthquake waves? (2500m/s)
b) If the frequency (f) of the wave was 15Hz, what was the wavelength(A) of this seismic wave? (167m)
c) What was the time for one wave to pass, the period (T)? (0.67sec)

b) If the frequency (f) of the wave was 15Hz, what was the wavelength(A) of this seismic wave? (167m)

Step-by-step explanation:

step-by-step explanation:

it's is b

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.