Give the linear system: 3x + 7y = 20 x ? 4y = 9 identify the values for the elements in the coefficient matrix: a = a11 a12 a21 a22 a11 = a12 = a21 = a22 =

a11 = 3, a12 = 7, a21 = 1, a22 = -4

Explanation:

3x + 7y = 20

x  -  4y = 9

A =

          column 1         column 2

row 1:    (a11) 3               (a12)   7

row 2:   (a21) 1               (a22) -4

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

answer: 4 meters

step-by-step explanation: to you understand 2/3 better you can do 1 divided by 3 = . then multiply that by the 2 which is .66666666666666667 then you would do 6 x .66666666666666667 which is 4.      

hope this .