Aston university creates a 10 digit student number as the university enrolls each student. the first two characters must be a digit 1 through 9. the next seven characters can be anything and the last digit just can’t be the same as the ninth character (i. e. the previous digit). how many student numbers are possible?

step-by-step explanation:

oof the porridges

your answer is 23/2 - 13.5

step-by-step explanation:

7/2 evaluates to

multiply x and 4.5

multiply x and 1

the x just gets copied along.

the answer is x

x

4.5*x evaluates to 4.5x

multiply 3 and 4.5x

multiply 1 and x

the x just gets copied along.

x

4.5*x*3 evaluates to 13.5x

7/2-4.5*x*3 evaluates to

  + 8 =

the answer is

7/2-4.5*x*3+8 evaluates to

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