A four - digit serial number is to be created from digits 0 through 9. How many of these serial number can be created if 0 can not be the first digit, no digit may be repeated, and the last digit must be 5?

50.6

step-by-step explanation:

answer: what do you mean

21

step-by-step explanation:

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.