book Maths Puzzle Numerical Ability

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

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book Other Question

My teacher is moving me up to Algebra, and I know anything. If you could give me a list of sites with good algebra games, ect that'd be awesome Solve each equation. Identify each equation as a conditional equation, an inconsistent equation, or an identity

1/2b - 1/2 = 1/4b