Question: An open rectangular box with volume 2 m3 has a square base. Express the surface area of the box as a function of the length

An open rectangular box with volume 2 m3 has a square base. Express the surface area of the box as a function of the length of a side of the base. Find a formula for the described function and state its domain.

===58. A cell phone plan has a basic charge of $35 a month. The plan includes 400 free minutes and charges 10 cents for each additional minute of usage. Write the monthly cost C as a function of the number x of minutes used and graph C as a function of x for 0 < x < 600.

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