How changing the frequency and amplitude affect the sound heardby the listener? higher amplitude results in louder volume and vice versa, while higher frequency results in higher pitch and vice versa

Therefore the level (volume) is proportional to the square of the amplitude

Explanation:

The amplitude of the one sound signal is related to the volume that is heard,

P = A2

 Where P is the power that the volume heard and A the amplitude of the signal.

Therefore the level (volume) is proportional to the square of the amplitude

The frequencies are related to the tone of the sound, the more frequent the more acute the sounds are and the less frequent the more serious is the sound heard.

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50