Question

8 it is $-12.5^circ$c outside when the temperature starts increasing by $2.5^circ$c each hour. how long will it take for the temperature to reach $-5^circ$c?

Explanation:

Step1: Find temperature difference

Calculate the difference between target and initial temp: $-5 - (-12.5) = -5 + 12.5 = 7.5^\circ\text{C}$.

Step2: Calculate time

Divide temp difference by hourly increase: $\frac{7.5}{2.5} = 3$ hours.

Answer:

3 hours