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(21) . Imaginary Part of the multiplicative inverse of a number 6-5i is?

(22) . If z - a is a factor of polynomial P(z), then P(a) is always?

(23) . Solve: A = [aij] be n square matrix If a2i = 0 for all j 1, 2, 3, …, n, then the matrix A is?

(24) . The centroid of a Wangle LMN with vertices L(1,1,1), M(3, 3, 3), N(5, 5, 5) is the point?

(25) . The projection of a vector a= i+j+k on anther vector b= 3jk+3k is?

(26) . The work done by a force F = i+j+k in moving an object from a point p(1,1,1) to the point Q(1,2,2) is?

(27) . The moment about a point p(0, 0, 0) of the force F = 21-i-k applied at Q(1, 1,1) is?

(28) . The population of a city increases by 700 each year If the population grows to 25000 in five years. its initial populations was?

(29) . The sum of the first seventy positive odd integers is?

(30) . The sum of the first seventy positive even integers is?