Question

OMG PLEASE HELP
The logarithmic function y = logx + 7.9 can be used to determine the magnitude, y, of an earthquake given an intensity comparison, x, of a previous earthquake—in this case, an earthquake with a rating of 7.9 on the Richter Scale. This function is graphed below.

What is the magnitude of an earthquake, y, that is seven times as intense as the previous earthquake (rounded to the nearest tenth)? What intensity, x, is the aftershock with a magnitude of y = 8.9 (rounded to the nearest whole number) compared with the original 7.9 earthquake?

Answer 1

A.Magnitude of earthquake: y = 9.0, intensity comparison: x = 9 times
B.Magnitude of earthquake: y = 8.7, intensity comparison: x = 4 times
C.Magnitude of earthquake: y = 39.0, intensity comparison: x = 2 times
D.Magnitude of earthquake: y = 8.7, intensity comparison: x = 10 times

Answer 2

hint:
if we solve this equation:
\[8.9 = \log x + 7.9\]
we get:
\[\log x = 1\]

Answer 3

?? what do i do with the one

Answer 4

please, you have to find \(x\). It is a logarithmic equation, so we can write this:
\(x=10^1=...?\)
I have used the definition of logarithm, furthermore, I think that the base of such logarithm is \(10\)

Answer 5

I see I must study more thank u

Answer 6

:)