The number of decks of popular trading cards is a function f of the number of days d since the shipment arrived. Calculate the average rate of change from day to day 20.
A. -0.012 decks per day
B. -83.1 decks per day
C. 83.1 decks per day
D. 0.012 decks per day

that would be a

Step-by-step explanation:

38.6°

step-by-step explanation:

resultant is 10 pound

smaller force = 8 pound

angle formed = tan⁻¹(

                        =tan⁻¹(

                          =tan⁻¹(0.8)

                        =38.6°