Which operation gives a result of 1.39? sum of 2.39 and -130 sum of 0.63 and 1.25 sum of -2.96 and 4.35 sum of -5.66 and 1.25

Sum of -2.96 and 4.35

Step-by-step explanation:

Sum of 2.39 and -130,

Sum of 0.63 and 1.25,

Sum of -2.96 and 4.35

Sum of -5.66 and 1.25,

Hence, only the operation ' Sum of -2.96 and 4.35 ' gives the result 1.39.

isi

step-by-step explanation:

use that smart brain

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)