exam Maths Puzzle Numerical Ability

One root of the function y=x^2-10x+k is 5+2isqrt3. What is the value of k????

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Please help me solve this:

Suppose $1000 is invested at an annual rate of 5.7% compounded continuously.

A.What is the ammount after 6 years?
B.How long would it take for the ammount in the account to quadruple? write an equation of the line that passes through the given point and is parallel to the given line. Write the answer in slope-intercept form.

(4,-2),x=(5/4y)-2