SB starts with 300.
BB starts with 500.
UTG starts with 500.
MP starts with 500.
MP+1 starts with 155.
LJ starts with 500.
HJ starts with 500.
CO starts with 500.
BTN starts with 500.

Hero is BTN with 9T

SB posts sb 2.
BB posts bb 5.

UTG calls (5).
MP calls (5).
MP+1 calls (5).
LJ calls (5).
HJ calls (5).
CO calls (5).
HERO calls (5).
SB raises to 20.
UTG calls (15).
MP calls (15).
MP+1 calls (15).
LJ calls (15).
HJ calls (15).
CO calls (15).
HERO calls (15).

Pot 165.
*Flop* comes 8 7 2.

SB bets 50.
UTG folds.
MP raises to 235.
MP+1 calls (135) (allin).
LJ folds.
HJ folds.
CO folds.
HERO ???


My question is, am I mathematically priced in to call and if so can you explain why?
We can even make it easy for math and say Hero has to put in $500 to win the $1500(total amount in pot if money gets all in)
Can someone explain this hand in terms of pot odds and when you are mathematically supposed to call?