Zhang tried to evaluate an expression step by step -x/3 / 2/y

Step 1 = -x/3 / 2/y

Step 2 = -x/3 / y/2

Step 3 = -xy/6

Find Zhang's mistake

A Step 1

B Step 2

C Step 3

D Zhang did not make a mistake

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)

d

step-by-step explanation: