Answer:
I believe 252
Step-by-step explanation:
Answer: 9+3×9×9 = 9+243 = 252 possible 3-digit numbers with at least
2 digits the same.
42/24 = 42/24 or 7/4 = 42/24 so yes
18/45 can be divided by nine, so it would be 2/5
Let f(x)=y
f^-1(x)=x
y=1/(x+5) - 1
y+1=1/(x+5)
(x+5)=1/(y+1)
x=1/(y+1)-5
f^-1(x)=1/(x+1) -5
denominator cannot equals to zero
x+1≠0
x≠-1
answer
B