Pls help for brainlist

9 /12 -4/12 = 5/12

Step-by-step explanation: First you need to find the same demointaor  which can be 12 .You take  3/4 and times on boths side by 3 which gives you 9/12 .You take 1/3 and times on both sides by 4 which gives you 4/12. Now put 9 /12 and then put  4/12 and then subtract both which gives you 5/12.

Look at pic below.

the amount you'd have after the work is $1.55

step-by-step explanation:

you subtract 95% from $31.

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)