exam Maths Puzzle Numerical Ability

The number of milligrams of a certain substance per liter in samples of drinking water all tested within .05 of 40 milligrams per liter. Write this information as an inequality, us

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exam Other Question

Solve the followinf inequalities..

{{{ x^2+4x+3>0 }}}.

{{{ x^2+3x>-2) }}}.

{{{ x^2-2x-3<0 }}}.

{{{ x^2+5x<-4) }}}. solve for x: radical sign x-4= x-10 (the sign is over x-4 only)I got x=13 x=-8, but the -8 was extraneous....am i correct???