What is 0.3y minus 3y squared?

Answer 1

0.3y - 3y2 is an answer unless you have a range for y

if it was (0.3y - 3y)2 it becomes (2.7y)2 which is 7.29y2

if it was 0.3y - (3y)2 the answer is 0.3y - 9y2

that's assuming if this is just algebra if you are asking about calculus you need to provide more information. there are too many possibilities depending on what you are asking for