Write a variable expression to describe the rule of each progression then calculate the term 20 or 20 term 1.) 6,12,18,24,...
2.)3,6,9,12,...
3.)1,5,9,13...​

The intensity, or loudness, of a sound can be measured in decibels (db), according to the equation 0b is the intensity of a given sound and lo is the threshold of hearing intensity. what is the intensity, in decibels, [l(db)], when 1 - 10"(%)? use a calculator. round to the nearest whole number a. 15. b. 32 c. 320 d. 737