Answer:
72 chirps per minute.
Step-by-step explanation:
Dolbear's law state the relationship between the rate at which Snowy Tree Cricket chirp and the air temperature of their environment.
The formula that represents this situation is T = 50 + ![\frac{(N-40)}{4}](https://tex.z-dn.net/?f=%5Cfrac%7B%28N-40%29%7D%7B4%7D)
Where T is the temperature in degrees Fahrenheit and N is a number of chirp per minute.
Now we have to calculate the number of chirp per minute if T = 58° F
By replacing T = 58 in the given relation.
58 = 50 + ![\frac{(N-40)}{4}](https://tex.z-dn.net/?f=%5Cfrac%7B%28N-40%29%7D%7B4%7D)
58 - 50 = ![\frac{(N-40)}{4}](https://tex.z-dn.net/?f=%5Cfrac%7B%28N-40%29%7D%7B4%7D)
8 = ![\frac{(N-40)}{4}](https://tex.z-dn.net/?f=%5Cfrac%7B%28N-40%29%7D%7B4%7D)
Now we multiply the equation by 4 on both the sides.
(8)(4) = ![\frac{(N-40)(4)}{4}](https://tex.z-dn.net/?f=%5Cfrac%7B%28N-40%29%284%29%7D%7B4%7D)
32 = N - 40
N = 40 + 32
N = 72
Therefore, the rate at which Snowy tree cricket chirp will be 72 chirps per minute at T = 58° F