In algebra (mathematics), what is the solution to the system of equations $2 x + y = 11$ and $x - y = 1$ ?

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In algebra (mathematics), what is the solution to the linear equation $4 (2 x - 3) = 3 (x + 6)$ ?
In financial mathematics, an investment of $2000$ euros earns $5%$ compound interest annually. What is its value after $2$ years?
In geometry (mathematics), what is the total surface area of a cube with edge length $5 cm$ ?
In statistics and probability, what is the median of the dataset ${3, 7, 8, 12, 14, 19, 21}$ ?
In algebra (mathematics), what are the roots of the quadratic equation $x^{2} - 7 x + 10 = 0$ ?
In financial mathematics, a consumer price index rose from $112.0$ to $118.72$ over two years. What was the exact percentage increase?