Which of the following equations have a solution of -50?
a)b-(20) = -30
b)-2r = 50
b)x/2 = -25
c)n + (-16) = 65

Its x/2 = -25 because if you transpose 2 to the other side, it'll become -25*2 which is equal to -50

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)