Solve for x. 9x - 1 = -11

x = 1 1/9
x = -1 3/9
x = 1 3/9
x = -1 1/9

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

Astore is having a sale in which all items are reduced by 20 percent. including tax, jennifer paid $21 for a pair of shorts. if the sales tax is 5 percent, what was the original price of the shorts