Which of the following equations is of a parabola with a vertex at (0, 6)? y = ( x + 6) ^2
y = ( x - 6) ^2
y = x^2 + 6
y = x^2 - 6

For a school science project, john noted the temperature at the same time every day for one week. the high temperature for the week was 27°f, and the low temperature for the week was −3°f. what is the difference between the high and low temperatures john recorded?