The temperature is - 4. At 7:00 am a warm front come through and the temperature increases 2 degrees every hour. At what time does the temperature reach 18 degrees?

at 6:00 pm the temperature reaches 18 degrees

Step-by-step explanation:

since the temperature increases linearly with the time then

t = t₀ + m * (T-T₀)

where

t = time at temperature T

t₀ = initial time at temperature T

m = increase in time with temperature

T₀ = initial temperature

therefore replacing values

t = 7 hour + 1 hour/2°C * [18°C - (-4°C) ] = 18 hour → 18:00 = 6:00 pm

thus at 6:00 pm the temperature reaches 18 degrees