book Maths Puzzle Numerical Ability

1) a5.a3=,...
2) (3a2b)(-2ab3)=

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book Other Question

Could you show me an algebraic inequation in it's simplest form for the following:

I can purchase 250g of mild cheese for $3.00 or 250g of mature cheese for $3.50. What possible Quadrilateral- find the value of x. I have tried and tried to work this out and when I plug in my answer it doesnt figure. Please help I would appreciate it.
(x+30)+(x-55)+(x-45)+ x=360 Thank you so very much!!