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how do i solve this?

When x number of units are sold, the price of each unit (in dollars) is given by . Find the unit price when the following quantities are sold: 2,7,9,11.

You seem to have omitted an equation after the word "by"

the equation is :

p= -x/2 + 75

If p = -x/2 + 75 ,
then when x (which is the number sold) = 2,
p (which is the price per unit) = 75 - 2/2 = $74

Do the others the same way.

When x = 11, the price is 75 - 11/2 dollars = $69.50

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