exam Maths Puzzle Numerical Ability

I HAVE A QUESTION ON SOLVING BY FACTORING((( X^2+6X+8=0 )))

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exam Other Question

Please show me the square root Of:

82.53

thanks! how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution. Can you please show the formula for mixture problems. thank you.