A rectangle has sides given as 6 cm and 15 cm to the nearest cm. Calculate the maximum value for the perimeter.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x

i think its a.

hope this