a group of 20 children. Boys Girls Left-handed 3 N Right-handed co 9 o A child is chosen at random from the group. a) What is the probability that the chosen child is a girl? Give your answer as a fraction. b) What is the probability that the chosen child is a left-handed girl? Give your answer as a fraction

hi,

3. 12.15, you are correct.

4.2.01, your first digit is correct,

hope this !

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)