The temperature at sunset is 5°C. The temperature begins to drop at a rate of 2°C per hour. Which expression represents the temperature t hours after sunset?
A
2-5t
B
2 +5t
С
5 -2t
D
5+2t

The answer is C. 5 - 2t

Step-by-step explanation:

:)))

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)