From the sum of 3x-4y+5z,2x-7y and 9z-5y subtract -2xy-2y-2z

5x - 14y + 16z + 2xy

Step-by-step explanation:

Given expressions:

        3x - 4y + 5z

         2x - 7y

         9z - 5y

         -2xy - 2y -2z

Solution:

 Sum of 3x - 4y + 5z

               2x - 7y

                9z - 5y

    =  3x - 4y + 5z + 2x - 7y +  9z - 5y

    = 3x + 2x - 4y - 7y -5y + 5z + 9z

     = 5x - 16y + 14z

Subtract  -2xy - 2y -2z

    = 5x - 16y + 14z - ( -2xy - 2y -2z )

    = 5x - 16y + 14z + 2xy + 2y + 2z

    = 5x - 16y + 2y + 14z + 2z + 2xy

   = 5x - 14y + 16z + 2xy

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total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98