Please help with this i would be so glad and happy.

Step-by-step explanation:

d) (-2 +4i) -( 3 + 9i) = -2 + 4i - 3 - 9i

                             = -2 - 3 + 4i - 9i

                             = -5 - 5i

e)3i(6 - 5i) =  3i *6 - 5i * 3i

                = 18i - 15*i²                    {i² = -1}

                = 18i -15*(-1)

                = 18i + 15

                 = 15 + 18i

f) (-3 + 7i)(1 - 2i) = (-3)*1 - 2i * (-3) + 7i *1  - 2i* 7i

                         = -3 + 6i + 7i - 14i²

                        = -3 + 6i + 7i - 14*(-1)

                        = -3 + 6i+ 7i + 14

                        = 11 + 13i

the expected value of the random variable : 0, 1 and 2

step-by-step explanation: