The number of decibels, d, produced by an audio source can be modeled by the equation d=10 log (1/k), where 1 is the sound intensity of the audio source and K is a constant . how many decibels are produced by an audio source whose sound intensity is 1,000 times the value of k? F.) 4
G.) 30
H.) 40
J.)100
K.) 10,000

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9

move it to the other side

step-by-step explanation:

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2