exam Maths Puzzle Numerical Ability

Hi Can I have some help with the following problem?

Biologists have observed that the chirping rate of crickets of a certain species is related to temperature, and the relations

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PlEASE help!
Raffle tickets.
One thousand raffle tickets are sold for $1 each. One prize of $800 is to be awarded.
a) Rena Condos purchases one ticket. Find her expected value.
b) Determine the fair price of a ticket. Can someone please explain this and dumbify it down - thank you so much in advance:

Multiply:
(5√[2] + 3)(√[2] - 2√[3])