The document contains 6 math exercises involving vectors and matrices. In exercise 1, it finds the sum and unit vector of two vectors, and the angle between them. Exercise 2 involves taking the cross product of two vectors. Exercise 3 multiplies matrices and adds the result to another matrix. Exercise 4 finds the inverse of a matrix using Gaussian elimination and the adjugate method. Exercise 5 inverts a matrix using Gaussian elimination. Exercise 6 calculates the determinant of a matrix using cofactor expansion and Sarrus' rule.