Number 12 is wrong, 13 is right, and I can't read number 1. Number 12 could be 3/6 or 5/6.
Answer:
B
Step-by-step explanation:
600+125+175=900-400(deposit)=500
or
600-125-175-300-200=100+400=500
Brainliest Please :)
9/15. There are 15 cards and 8 of them are odd and 1 is a 2.
Let

. Then

, and differentiating both sides with respect to

gives


Now, when

, you get

You have

, so

and

. So