book Maths Puzzle Numerical Ability

there were 429 people at a play. admission was $1 for adults and $0.75 for children. the receits were $372.50. how many adults and how many children attended the play?

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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
I do not understand how to do this question. I tried making a chart and finding the slope, but it didn't help. e_e;;

Help on this problem would be greatly appreciated. Thank you