3 problems........just need to make shure their right ....................help?

Question

#1

A number n decreased by 8

it is N - 8 right or wrong

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#2
evaluate the expersion for v = 8

25 - v = 17 right or wrong
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#3
a number decreased by 2

2 - n right or wrong

Answer 1

#1 Right
#2 Right (if you meant expression)
#3 Should be n-2, since you're decreasing a number n by 2 and not decreasing 2 by a factor of n

Answer 2

What the first guy said: #1 Right #2 Right #3 shoul be n-2; not 2-n
Ex. (n=5; 2-n= -3 ; n-2= 3)

Answer 3

1.) n - 8
2.) 25 - 8 = 17
3.) n - 2