Q-3: x-4 -6 -71 [1 3 Let A = -3 x+1 10 and B = 3 0 0 -3 0 LO a) Find values of x for which the matrix A is singular. b) Find a matrix X such that (A-1)TX = B if x = −1. c) Is the linear system has unique solution at x = -5. Justify.

21 do 28. +1 (222)2

discrete math   How many phone numbers (7 digits) have no numbers larger than a 6 if the first digit of a phone number can be neither a 0 nor a 1? How many such phone numbers do have a number larger than a 6?

9>n-6

Discrete Math

Please solve the screenshot, thank you!