A rectangular area adjacent to a river is fenced​ in; no fence is needed on the river side. The enclosed area is 1500 square feet. Fencing for the side parallel to the river is $10 per​ foot, and fencing for the other two sides is $2 per foot. The four corner posts are $20 each. Let x be the length of one of the sides perpendicular to the river.       Question content area bottom Part 1 ​(a) Write a function​ C(x) that describes the cost of the project.   C(x)=enter your response here ​(Simplify your​ answer.)

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