book Maths Puzzle Numerical Ability

1. x=8log100(10)

Next two need to be written as a single expression with coefficient.
2. logaK-logbM-logbA

3. logb(2y+5)-1/2logb(y+3)

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hi! hope someone can help me with problems...with solutions please. thanks so much!!!

30) There are 300 people in John’s graduating class. 40% of them went to the Senior Prom w
-4(z+7)=23

-90=3(-2z-8)

-(7-h)=13

120=9n+6n

15q-18q-12=9