Suppose a, b,c and d are positive real numbers that satisfy the system of equations (a+b) (c+d)=143
(a+c) (b+d)=150
(a+d) (b+c)=169
Compute the smallest possible value of a²+b²+c²+d²

to find the unit price, we must figure out the cost of one item (in this case one dish towel).   to do this, we divide the total price ($7.92) by the number of items bought (for this problem it is 8, because there are eight dish towels in one pack).  

$7.92/8 = $0.99

therefore, the unit price, or the price of one dish towel, is $0.99.

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step-by-step explanation:

i think its a.

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