A company manufactures a certain item and sells it online. The company has a business model where the cost C, in dollars, to make x items is given by the equation C=2.5x+21 and the revenue R, in dollars, made by selling x items is given by the equation R=6x. The break even point is the point where the cost and the revenue intersect. How many items must the company sell to break even?

i need on these three questions. find standard form equation of line perpendicular to y = (2/3)x - 8 that goes through the point

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answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

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