Question

S is directly proportional to the square of r. When r is increased by 200%, find an expression for the new r. Just need a second opinion.

Answer 1

The answer is 3r, since an increase of 200% is multiplication by a factor of 3.

Answer 2

are you sure it's not r^2 + 2r?

Answer 3

Positive. If you are 3 feet tall and you grow by 0%, then you are still 3 feet tall. If you grow by 100%, you have doubled in height to 6 feet. If you grow by 200%, you've tripled, etc.

Answer 4

I see, good comparison

Answer 5

When in doubt, always just try to think of a real life example :)