A and d seem correct to me.
b and c are definitely wrong.
Answer:
35
Step-by-step explanation:
If they won 4/5 then they lost 1/5. If 1/5 is 7 then you need five 7s.
7 × 5 = 35
Answer:
Step-by-step explanation:

Auxialary equation is

General solution is



Eliminate B to get
3A =a-1
We know that y tends to 0 when x tends to infinity for any finite A
i.e. a should be a finite real number.