Moderate# Finding $k$ From a Table

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Assuming that $ f(x)$ is a continuous function over the interval $[2,10]$, the following table gives the function values for selected values of $x$. Forming a Left Riemann Sum using the intervals of width **2** suggested by the table, find the value of $k$ given the approximation of the integral is as follows:

$$\int _{ 2 }^{ 10 }{ f( x ) dx } =90$$