book Maths Puzzle Numerical Ability

how do u solve a polynomial equation for x?

Ex:8/x^2-4 + 2/x = x/x-4

the slashes are division... so it would be 8 over x squared -4 and the u add 2 over x

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book Other Question

ok i have done 21 of these and here are the ones i cant get...

Use log9^7=0.8856 and log9^4=0.6309 to evaluate each expression

log9^28
log9^49
log9^144
log9^15.75
How do you find the equation of a line from a few points?

Q: Find the equations of both lines.

The solutions of line m are (3,3), (5,5), (15,15), (34,34), (678,678), and (12