Algebra 2 ?

5. a construction explosion has an intensity i of 1.25 x 10–4 w/m2. find the loudness of the sound in decibels if w/m2. round to the nearest tenth. (1 point)

81 decibels
161 decibels
82.2 decibels
12.5 decibels

the example question in the textbook is totally different so i'm not sure how to do this. i tried to make the equation and then got confused. an explanation would be great!

Given a circle with a radius of 2 which is the length of an arc measuring 75

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

The number of hours per week that the television is turned on is determined for each family in a sample. the mean of the data is 37 hours and the median is 33.2 hours. twenty-four of the families in the sample turned on the television for 22 hours or less for the week. the 13th percentile of the data is 22 hours. approximately how many families are in the sample? round your answer to the nearest integer.