Answer:
B because u will have to first open the bracket according to BODMAS: bracket of division multiplication addition and subtract trust me before solving something like this use this <u>BODMAS</u>
Answer:

Step-by-step explanation:

We´ll <u>Apply Difference Two Squares Formula:</u>


<u>Apply exponent rule</u>:


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Sample space: H1, H2, H3, H4, T1, T2, T3, T4
All outcomes if the card is three: H3, T3
I was unclear about the last two parts of the question.