5*10^5 is how many times bigger that 1*10^5

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625

Can someone show me step by step how to do this?

In terms of x, find an expression that represents the area of the shaded region. the outer square has side lengths of (x+5) and the inner square has side lengths of (x-2), as shown. area: a1 x + a2 square units submit