A population of bacteria grows according to $P (t) = P_{0} e^{k t}$ . If population triples in 4 hours, what is $k$ ?

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If $3 x - 5 = 2 (x + 4) - 7$ , what is the value of $x$ ?
A line in the xy-plane passes through the points $(2, 5)$ and $(6, 13)$ . What is the slope-intercept equation of this line?
Solve the system of equations for $y$ : \begin{cases} 2x + 3y = 12 \\ x - y = 1 \end{cases}
If $f (x) = 2 x^{2} - 3 x + 4$ , what is the value of $f (- 2)$ ?
Which of the following functions has a graph that does NOT intersect the x-axis?
If $\frac{2}{x - 3} = \frac{4}{2 x + 1}$ , what is the value of $x$ ?