Find the length of the line segment that is parallel to the directrix of a parabola, that
passes through the focus, and that has endpoints on the parabola. Complete the
explanation.

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?