The variable t represents the temperature at 6 p. m.
which equation would best model the word problem below?
the temperature at the summit of mt. washington dropped 19°f between 6 p. m. and 10 p. m. the temperature at 10 p. m. was –12°f. what was the temperature at 6 p. m.?
a.
12 – 19 = t
b.
19 + 12 = t
c.
t – 19 = –12
d.
19 – t = –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)