Mixed crassword

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Across
  1. 3. a11C11+a12C12+...a1nC1n what is this formula
  2. 5. Find the rank of matrix {a11=1 a12=2 a13=4;a21=-1 a22=2 a23=1}
  3. 6. A 4x7 has four columns [true or false]
  4. 8. Which matrix can be addition
  5. 9. What is the dimension of the row space of a matrix A called
  6. 13. The matrix derived from the cofficient and constant terms of a system of linear equations.What is called
  7. 15. Find AB and write the sum of elements in the third column A={a11=1 a12=-1 a13=7;a21=2 a22=-1 a23=8;a31=3 a32=1 a33=-1} B={a11=1 a12=1 a13=2;a21=2 a22=1 a23=1;a31=1 a32=-3 a33=2}
  8. 18. A={a11=2 a12=-3 a13=1;a21=5 a22=10 a23=6;a31=8 a32=-7 a33=5}Find the rank of matrix and multiply the answer by seven
  9. 19. What is a rectangular array of mxn real numbers arranged in m horizontal rows and n vertical columns
  10. 20. To solve the system and find x-y -3x+5y=-22;3x+4y=4;4x-8y=32
Down
  1. 1. What is called a diagonal matrix for which all terms on the main diagonal are equal
  2. 2. What is called the matrix containing only the cofficients of the system
  3. 4. What is the matrix called if the elements located bellow or above the main diagonal are equal to zero
  4. 7. Calculate the determinant A={a11=-7 a12=0 a13=0;a21=0 a22=1 a23=0;a31=0 a32=0 a33=1}
  5. 10. Which matrix has an inverse
  6. 11. What should a11,a22...ann equal [While finding the rank]
  7. 12. The determinant of the 2x2 matrix A is a21a12-a11a22 [true or false]
  8. 14. Rewriting a system of linear equations in row echelon form usually involves a chain of equalent system each of which is obtained by using one of the three basic operations.What is this process called
  9. 16. A={a11=1 a12=4;a21=-1 a22=-3}Find the determinant of the matrix that is the inverse of the matrix A and multiply the answer by 8
  10. 17. What is the dimension of the nullspace of A called