A = acres, s = square miles.
Replace s with 7.5 and multiply:
640 * 7.5 = 4,800 acres.
The answer is the last choice.
Answer:
C
Step-by-step explanation:
Divide 24 by 8 equals 3..
This is a simple conversion. 1 gram equals .0022 lbs, meaning this is what you have to do: 58g*(.0022lbs/1g). The grams cancel out, and you're left with pounds.
We can use the formula for a parabola:
![y = c(x - a) + b](https://tex.z-dn.net/?f=y%20%3D%20c%28x%20-%20a%29%20%2B%20b)
where
![(a,b)](https://tex.z-dn.net/?f=%28a%2Cb%29)
is the origin of the parabola and
![c](https://tex.z-dn.net/?f=c)
is some constant scaling factor.
We are given that the center of the arch on the bridge is
![(0, 0)](https://tex.z-dn.net/?f=%280%2C%200%29)
. This is our origin. So our equation is:
![y = c(x - 0)^2 + 0 = cx^2](https://tex.z-dn.net/?f=y%20%3D%20c%28x%20-%200%29%5E2%20%2B%200%20%3D%20cx%5E2)
Now we just need to find c. We can do this by plugging in one of the other points given:
![-13 = c*7^2](https://tex.z-dn.net/?f=-13%20%3D%20c%2A7%5E2)
![\frac{-13}{49} = c](https://tex.z-dn.net/?f=%5Cfrac%7B-13%7D%7B49%7D%20%3D%20c)
So our final equation for the arch of the bridge is: