Answer:
Kindly check explanation
Step-by-step explanation:
Given the sound model:
s = 10│x - 4│+ 50
x = measure of music played ; s = sound level I. Decibel
Number measure at which sound level = 80
Plugging values into the equation:
80 = 10│x - 4│+ 50
Subtract 50 from Both sides so as to eliminate the 50 on the right hand side
80 - 50= 10│x - 4│+ 50 -50
30 = 10 |x - 4| + 0
Divide through by 10 so as to isolate the absolute inequality expression
3 = |x - 4|
Eliminate the absolute value sign
±3 = x - 4
Hence,
x = - 3 + 4 = 1
x = 3 + 4 = 7
Hence, x = 1 ; x = 7
