Whats the symbol for a member or element of a set help with anyone of these questions please am giving brainlist to who answers the most questions​

Charlie tosses five coins.what is the probability that all five coins will land tails up.

Eiko is wearing a magic ring that increases the power of her healing spell by 30%30\%30%30, percent. without the ring, her healing spell restores health points. which of the following expressions could represent how many health points the spell restores when eiko is wearing the magic ring?

Astudent is solving a system of equations by substitution and comes up with the solution 3 = 3. assuming that he solved the problem correctly, which of the following can be said about this system of equations?