The answer for this would be 23.4.
This is because 1.3 = 1 mile. Therefore you should do 1.3 x 18
which equals 23.4!
Answer: ![y=\sqrt[]{\frac{x+4}{2} }](https://tex.z-dn.net/?f=y%3D%5Csqrt%5B%5D%7B%5Cfrac%7Bx%2B4%7D%7B2%7D%20%7D)
Step-by-step explanation:
![y=2x^2-4\\x=2y^2-4\\x+4=2y^2\\\frac{x+4}{2}=y^2\\ y=\sqrt[]{\frac{x+4}{2} }](https://tex.z-dn.net/?f=y%3D2x%5E2-4%5C%5Cx%3D2y%5E2-4%5C%5Cx%2B4%3D2y%5E2%5C%5C%5Cfrac%7Bx%2B4%7D%7B2%7D%3Dy%5E2%5C%5C%20y%3D%5Csqrt%5B%5D%7B%5Cfrac%7Bx%2B4%7D%7B2%7D%20%7D)
Let S, M, L represent the shortest, mid-length, and longest sides, respectively. You are given three bits of information.
.. S +M +L = 14.5 cm
.. L = 2S
.. L = 6.2 cm
You can use an equation something like this to find the middle-length side.
.. (6.2 cm)/2 +M +6.2 cm = 14.5 cm
.. M +9.3 cm = 14.5 cm . . . . . . . . . . . . . constant terms collected
.. M = 5.2 cm . . . . . . . . . . . . . . . . . . . . . subtract 9.3 cm
Now, you know the side lengths are 3.1 cm, 5.2 cm, 6.2 cm.
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You have not offered any choices for "which equation," so take your pick of those used here.
