What is the justification for step 2 in the solution process? 12y − 40 − 4y = 6y − 18 Step 1: 8y − 40 = 6y − 18 Step 2: 2y − 40 = -18 A. the subtraction property of equality B. the division property of equality C. the addition property of equality D. the multiplication property of equalit

2y=-18+40

2y=22

y=22/2

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)