Answer:
![\large\boxed{4x+6y^3}](https://tex.z-dn.net/?f=%5Clarge%5Cboxed%7B4x%2B6y%5E3%7D)
Step-by-step explanation:
![2x+x+x+2y\times3y\times y\\\\=(2x+x+x)+(2y\times3y\times y)\\\\=4x+(2\times3)(y\times y\times y)\\\\=4x+6y^3](https://tex.z-dn.net/?f=2x%2Bx%2Bx%2B2y%5Ctimes3y%5Ctimes%20y%5C%5C%5C%5C%3D%282x%2Bx%2Bx%29%2B%282y%5Ctimes3y%5Ctimes%20y%29%5C%5C%5C%5C%3D4x%2B%282%5Ctimes3%29%28y%5Ctimes%20y%5Ctimes%20y%29%5C%5C%5C%5C%3D4x%2B6y%5E3)
21\25
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429.8x 4 days=1,719.2miles driven on a four day trip.
They are intertwined the domain is the allowed values of the independent varialbles and the range is the allowed values of the dependent variable.