605 16. 85 For each situation, express using permutation notation and solve. can a 19. How many different 3-letter "words" be formed from the letters in factor if letters cannot be repeated within a 3-letter "word”? 20. A C major scale includes 8 musical notes How many different measures consisting of four notes from this scale could be played if notes are not repeated?

i do not know this sorry : (

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

25 questions , because they start with 100.  

350-100=250 .  

. 250/10=25

step-by-step explanation:

first take off 100, then what x 10 = 250? that is your answer. (25)