PLEASE ANSWER
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A student was given the equation x2 + 6x − 13 = 0 to solve by completing the square. The first step that was written is shown below.

x2 +6x=13

The next step in the student’s process was x2 + 6x + c = 13 + c . State the value of c that creates a
perfect square trinomial.

Explain how the value of c is determined.

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?