369=12(n-4.25)
when solving this equation for n, what is the first step?
a- add 4.25 to both sides of the equal sigh
b-subtract 12 from both sides of the equal sign
c- multiply both sides by 12
d- divide both sides by 12

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)

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3