Which expression is equivalent to 7 b + 4 b minus 1 b?
2b
4b
10b
12b

i got 86 for this

hope this !

if you need an explanation just ask

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)

17

step-by-step explanation:

only 10/60 isn't equivalent

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