exam Maths Puzzle Numerical Ability

6.28R(H+R) for R=10 and H = 17.2

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Please help me with these problems:

#1

sqrt 2t^5 * sqrt 10t^4


#2

(3-2 sqrt7)*(3+2 sqrt7)


#3

3+sqrt(x^2-8x)=0


#4

Sailboat Speed. The sail area-displace
6x+4y=16