I need help with this trig. Anyone down to help?

11) 0.976

12) -0.382

13) -0.5

14) 0.240

15) 0.866

16) 0.939

17) 0.206

Step-by-step explanation:

I used a calculator even though I noticed that you weren't supposed to.

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)