book Maths Puzzle Numerical Ability

Which is the recipirocal of 8/3 times 13/18?

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book Other Question

Write the equation of the line passing through (3, 7) and (6, 11).
I am not sure how to solve these types of problems. Please help.
what is
a^2-9a+14
3x^2+13x+4
3z^2-17z+20
4x^2-12+9

and solve for x 6x^2=63-13x