Perform the operation and write the result in standard form. $$(2i{)}^2$$

A) $-2i$
B) $-4$
C) $-4i$
D) $4i$
E) $2$

In the double forecasting model F_{t + k} = a_t + b_tk,F_{t + k} denotes the level in the model.

Which of the following is the basic material balance equation for the winter season?

A) P_W + I_W = 100
B) P_W - I_W ≥ 450
C) P_W + I_A - I_W ≤ 100
D) P_W + I_A - I_W = 450

Refer to Kelly Jordan. Compute the number of shares of common stock Kelly Jordan received when he converted.​

What is the population standard deviation (σ) for this set of data? 42, 50, 45, 37

A) 5.45
B) 43.50
C) 22.25
D) 4.72