exam Maths Puzzle Numerical Ability

x^2+5x+4/(x+3)^2 Divide by x+1/x^2-9

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i have a right triangle with a circle inside. the height is 3 and the base is 4. the long diagonal side is 5. i need to know what the radius of the circle is? The approximate population of San Jose was 460,000 in 1970. In 1980 it was 630,000. Find k in the growth formula and estimate the population in 2020.