Which of the following functions best describes this graph?

Answer D is correct.  The two factors (x - 6) and (x - 3) become zero at x = 6 and x = 3, respectively, showing the x-intercepts of this graph.  Additionally, we can see that the sign of the leading coefficient of f(x) = (x - 6)(x - 3) is +, which indicates that the curve opens up.  This agrees with the given graph.

Step-by-step explanation:

The two factors (x - 6) and (x - 3) become zero at x = 6 and x = 3, respectively, showing the x-intercepts of this graph.  Additionally, we can see that the sign of the leading coefficient of f(x) = (x - 6)(x - 3) is +, which indicates that the curve opens up.  This agrees with the given graph.  Answer D is correct.

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.