exam Maths Puzzle Numerical Ability

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?

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exam Other Question

write the system of linear equations represented by the augmented matrix. Use x,y,z and if necessary w,x,y,z for the variables.

|4 1 5 1| 6|
|1 -1 0 -1| 8|
|3 0 0 7| 4|
|0 0 11 5| 3| One root of the function y=x^2-10x+k is 5+2isqrt3. What is the value of k????