book Maths Puzzle Numerical Ability

A bacteria culture has and initial population 10000. If its population declines to 3000 in 2hrs, what will it be at the end of 4 hrs?

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how do you graph x^2-x-7 as a parabola? A carpet has the dimensions X feet by (X + 2)feet. If its area is 224 square feet, what are the dimensions of the carpet?