Hand 1: shove is pretty bad I think, you can flat or fold (I'd probably fold)
Hand 2: Really bad spot to bluff. Passive villain can take the flat flop, check turn line with any number of holdings...none of which are folding really. 7x that he slowplays turn with, obviously not folding. Flush draw that he played passively, obviously not folding. Jx mayyyybe you could fold out but people hate folding flopped TP. Ax that flatted flop, not folding.
The only things will be able to fold out are missed gutshots (which you beat anyway) and 3x (miniscule portion of his range compared to the above, esp given that he flatted a 3bet).
Like someone else said c/c is an option here IF you have reads that 1) he is floaty and 2) he bluffs missed draws with a high frequency. But in the absence of good reads c/f is far and away the best option.
Hand 3: snapcall
If you want a quick way to estimate your equity on the flop, there's the rule of 4: count your outs and multiply by 4. Here you have 9 flush outs and 6 more straight outs. 15 * 4 is a whopping 60% versus AK (remember it's an estimate, the actual number is 57%).
If you apply the same rule to the 3flush hand you posted in the other topic, it's pretty easy to see that even a random flush draw is flipping with you as long as it has an over to your pair of 7s.