book Maths Puzzle Numerical Ability

hellow i dont realy lick doin algebra because it is to hard i tryed finding some help but i couldnt i looked on different sites but they said you have to download but my parents wo

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book Other Question

Determine wether -5 satisfies the compound inequality.

3x > -15 and -2x < 11
i=sqrt(p/r) if p=500 ,r=25. would that make the answer 20 ?