Alock has four dials. on each dial are the digits 0-9. how many possible combinations are there?

There are 6561 posible combinations.

Step-by-step explanation:

the lock has four dials.

And we know that the first dial has 9 posible numbers (0, 1, ... , 9)

the second dial also has 9 posible numbers, and it is the same for the other two.

The total number of combinations is the product of the posibilities for each dial:

c = 9*9*9*9 = 9^4 = 6561

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!

answer: 819.89 miles across america

step-by-step explanation: