Brainliest to the first correct answer
evaluate 9 ÷ 3[(20 − 7) − 22].
0.18
0.34
27
51

-27

Step-by-step explanation:

9÷3×((20−7)−22)

3×((20−7)−22)

3×(13−22)

3×-9

-27

b) well because you get well

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)