Question3 Solve the following x. y and z 3x + 3y - z 19 a) 5x +4y-2z = 28 2x +2y-z12 b) Find the inverse of A3 3 -1 40 0 c) Find the sum of the arithmetic series with first term 1, common difference 3, and last term 100. The sum of the first 20 terms of an arithmetic series is identical to the sum of the first 22 terms. If the common difference is -2, find the first term. How many terms are there in the geometric progression d) e) 14] 2, 4, 8. .. 128