Permutations + combination question The number of 4 digit numbers are there that contain no 5’s is ?

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.