Identify the error.
A. The student divided both sides by the length when he should have multiplied instead.

B. The student added the exponents instead of subtracting them when dividing.

c. Both A and B

d. Neither A nor B - The student did not make any errors

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)