Question

The value, y, in USD of a particular stock for 4 days, x, is shown in the table.

USD of Particular Stakes
days 0 1 2 3 4
stock value ($)
19.2 6.3 2 6.3 19.2
What type of function could be used to model the value, y, of the stock as a function of time, x?

(1 point)

exponential decay function

exponential growth function

quadratic function

linear function

Answer 1

Quadratic function.

Reason: The values are symmetric about x = 2 with a minimum at (2, 2), so they fit a parabola. In fact,
y = 4.3(x − 2)^2 + 2 matches the table.