Answer:
n= 45
Step-by-step explanation:
2/5×n=18
2n/5=18
2n/2=90/2
n=45
1/3 is the answer, 10 = 1/3 20= 2/3 30 = 3/3
The answer is: D) 115
The explanation is shown below:
1. You have that the frequency with which a cricket chirps varies directly with the temperature, which you can express it as following:
![y=kx](https://tex.z-dn.net/?f=y%3Dkx)
Where
is the frequency with which a cricket chirps,
is the temperature and
is the constant of proportionality.
2. If the cricket chirps 100 times per minute in 80° weather, you can calculate
as below:
![k=\frac{100}{80}=1.25](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B100%7D%7B80%7D%3D1.25)
3. Therefore, the frequency in 92° weather is:
![y=1.25x\\y=(1.25)(92)\\y=115](https://tex.z-dn.net/?f=y%3D1.25x%5C%5Cy%3D%281.25%29%2892%29%5C%5Cy%3D115)
First convert the total km's to miles:
4.8 km / 1.609 km per mile = 2.983 miles.
Now convert miles to feet:
2.983 miles x 5280 feet per mile = 15,751.39 feet Rounds to 15,751.40 feet