Question

A graph shows the horizontal axis numbered 2 to 8 and the vertical axis numbered 10 to 50. A line increases from 0 to 4 then decreases from 4 to 9.
Which type of function best models the data shown on the scatterplot?

Answer 1

A quadratic function (an inverted parabola). It has a single peak (increases up to x≈4 then decreases afterward), which matches the one turning point shown—unlike a linear or exponential curve.