The first step in determining the solution to the system of equations, y = -x2 - 4x – 3 and y = 2x + 5, algebraically is to set the two equations equal as – x2 - 4x – 3 = 2x + 5. What is the next step?
O Set y = 0 in y=-x2 - 4x – 3.
O Factor each side of the equation.
O Use substitution to create a one-variable equation.
Combine like terms onto one side of the equation.
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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?