book Maths Puzzle Numerical Ability

Create your own procedure for multiplying.
Use example 28.32 to explain in a paragraph your procedure.

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book Other Question

-4(z+7)=23

-90=3(-2z-8)

-(7-h)=13

120=9n+6n

15q-18q-12=9 I am not sure how to solve this one

ln (square root of x +4) =1

and

log base 2 (x-3) + log base 2x - log base 2 (x+2) =2