exam Maths Puzzle Numerical Ability

Can you please help me thank you...:)

Page 526
Number 6

I have to simplify and leave the answer in exponent form.

square root 2^3

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exam Other Question

Adult tickets for a play costs $14 and child tickets costs $3. If there were 26 people at a performance and the theater collected $199 from ticket sales. How many adults and children attended the play? Find the axis of symmetry.
y = x^2 - x + 10
I am unsure of how to start this problem