Question

I have iPhone x blah blah blah boom bang zikpah

Answer 1

T9 = 0

=> a + 8d = 0

=> a = - 8d --------(1)

T19 = a + 18d

T19 = - 8d +18d

T19 = 10d --------(2)


T29 = a + 28d

T29 = - 8d +28d

T29 = 20d ---------(3)


From equation 2 and 3, we get

T29 = 2 * T19

Answer 2

T9 = 0

=> a + 8d = 0

=> a = - 8d --------(1)

T19 = a + 18d

T19 = - 8d +18d

T19 = 10d --------(2)

T29 = a + 28d

T29 = - 8d +28d

T29 = 20d ---------(3)

From equation 2 and 3, we get

T29 = 2 * T19

hope it helped ⚡