The implied turning point (peak or trough) of y_t = 516 - 42t + 3t² would be in which period? Hint: Use calculus to solve for the value of t that would maximize or minimize y_t. A)t = 7 B)t = -7 C)t = 6 D)t = -42

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To find the turning point, we differentiate the given equation with respect to t, which gives us dy/dt = -42 + 6t. Setting this equal to zero to find the critical point gives 6t = 42, or t = 7. This is the value of t at which the function y reaches a maximum or minimum, implying the turning point is at t = 7.

The Implied Turning Point (Peak or Trough) of Yt =

The Implied Turning Point (Peak or Trough) of Y_t =