How many ways are there to put 4 balls in 3 boxes if the balls are distinguishable and the boxes are distinguishable?

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If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b

When a 757 passenger jet begins its descent to the ronald reagan national airport in washington, d. c., it is 3900 feet from the ground. its angle of descent is 6 degrees. how far must the plane fly to reach the run way? a. 37,106 ft b. 37,310.4 ft c. 23,456.6 ft d 2,492.7 ft