The temperature 13

The temperature in Toronto at noon during a winter day measured 4°C. The temperature started dropping 2° every hour. Which inequality can be used to find the number of hours, x, after which the temperature will measure below -3°C?

Correct answer:

x =  3.5 h

Step-by-step explanation:

$$\begin{gathered} t_1=4\text{ °C } \\ s=-2\text{ °C/h } \\ {t}_2=-3\text{ °C } \\ {t}_2=t_1+s\cdot x \\ (-3)=4+(-2)\cdot x \\ 2x=7 \\ x={\displaystyle \frac{7}{2}}=3.5=3.5\text{ h} \end{gathered}$$

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