What number must you add to complete the square? x^2 + 2x = -1 a.) 4 b.) 3 c.) 1 d.) 2 in advance for your

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What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.