book Maths Puzzle Numerical Ability

1/2+7/10x=13/20
solve for x

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book Other Question

Is it possible to calculate the height from a given chord to a given arc, given that the only information available is the length of both the chord and the arc, I have been trying to calculate this for some time but it is in vain?
Stumped, could you help?

Evaluate, when x=2

x^-1+(1/2)^x - cubed root x

I got 1 + cubed root x, am I close?