I can never find a answer to questions like this please help me!

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Determine the domain and range of the given function. the domain is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}. the range is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}.

Answer this question i need as soon as possible