1) if a>b>c>0, c=3?
1. 1/c > 1/3
2. 1/a + 1/b + 1/c = 1

Answer is D, Why?

2) John deposits $1000 in an account with annual rate x percent (compound quarterly), no other activity for this account, is account balance over $1050 after one year?
1. (1+x/200)^2 > 1.05
2. (1+x/400)^2 > 1.025

Answer is D, Why?


3) if |2x| > |3y|, is x>y?
1. x>0
2. y>0

Answer is A, why?

4) A(a,b) is the coodinate, is it on the line y=x?
1. a=2
2. b=a+2

Answer is B, Why?