Please help... will be greatful!

5,089.4 cm³

Step-by-step explanation:

Volume of the cylinder = πr²h

Where,

r = 9 cm

h = 20 cm

Volume of cylinder = π×9²×20 = π×81×20

Volume = 5,089.3801 ≈ 5,089.4 cm³ (1 dp)

b

step-by-step explanation:

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)