What is the correct answer written in standard form a) (7 x 10^5) x ( 3 x 10^2)
b) (2 x 10^5) / (4 x 10^2)

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)

answer: he is 272195

step-by-step explanation: all you have to do is multiple 3535 and 77 and it equals 272195