Given the sequence Tq=-7+3(q+4) find T4,and x if Tx=50.

Duh

T4 = -7+3(4+4)
= -7 + 3*8
= -2 + 24
= 17

50 = -7 + 3(q+4)
solve for q and that's your answer. Come on back if you get into trouble.