If 5a = 3125, then the value of 5(a – 3) is :
25
125
625
1625
Correct Answer : A
If logX (9/16)= -(1/2), then x is equal to
(log5 3)X(log3 625) equals
If log8 (X2+X)-log5(x+1)=2, then the value of x is