If the 3

If the temperature of a city drops 2° everyday and increases by 3° on every 5 days, how long does it take to drop to -15° from temperature +5°?

Correct answer:

n =  20 d

Step-by-step explanation:

$$\begin{gathered} t_2=+5 \\ {t}_1=-15^{\circ } \\ \mathrm{\Delta }=t_2-t_1=5-(-15)=20^{\circ } \\ n={\displaystyle \frac{\mathrm{\Delta }}{+3-2}}={\displaystyle \frac{20}{+3-2}}=20\text{ d} \end{gathered}$$

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