How many possible 4-digit combinations are there with the numbers 2, 3, 4, 5, 6, 7, 8, and 9 if none of the numbers appear more than once (i. e. 2343, 2333, 2323,

Step-by-step explanation:

we need a 4-digit number from the numbers (without repetition ).

possible number at thousand place

Possible numbers at hundred place

Possible numbers at place

possible number at unit place

So total possible numbers

Other method :

We are taking numbers out of and here order matters so we will use permutation.

Total possible numbers

its 0.1 miles per minute

step-by-step explanation:

gym b charges $1.05 less per hour than gym a.